diff --git a/app/code/Magento/Eav/Model/ResourceModel/UpdateHandler.php b/app/code/Magento/Eav/Model/ResourceModel/UpdateHandler.php
index a608dc3809e2f77360430f31dca8869eed8022df..c2f390e90e5d6e5330ca2f3db99bb80074da12a7 100644
--- a/app/code/Magento/Eav/Model/ResourceModel/UpdateHandler.php
+++ b/app/code/Magento/Eav/Model/ResourceModel/UpdateHandler.php
@@ -133,7 +133,7 @@ class UpdateHandler
                 }
                 if ((!array_key_exists($attribute->getAttributeCode(), $snapshot)
                     || $snapshot[$attribute->getAttributeCode()] === false)
-                    && !empty($data[$attribute->getAttributeCode()])
+                    && array_key_exists($attribute->getAttributeCode(), $data)
                     && !$attribute->isValueEmpty($data[$attribute->getAttributeCode()])
                 ) {
                     $this->attributePersistor->registerInsert(
@@ -146,7 +146,7 @@ class UpdateHandler
                 }
                 if (array_key_exists($attribute->getAttributeCode(), $snapshot)
                     && $snapshot[$attribute->getAttributeCode()] !== false
-                    && !empty($data[$attribute->getAttributeCode()])
+                    && array_key_exists($attribute->getAttributeCode(), $data)
                     && $snapshot[$attribute->getAttributeCode()] != $data[$attribute->getAttributeCode()]
                     && !$attribute->isValueEmpty($data[$attribute->getAttributeCode()])
                 ) {
diff --git a/app/code/Magento/GiftMessage/Model/Type/Plugin/Multishipping.php b/app/code/Magento/GiftMessage/Model/Type/Plugin/Multishipping.php
index ca30141e79a3277af049df340c3f68fb263508d0..be7b2ed01f72802008880444a3320ad5b496db14 100644
--- a/app/code/Magento/GiftMessage/Model/Type/Plugin/Multishipping.php
+++ b/app/code/Magento/GiftMessage/Model/Type/Plugin/Multishipping.php
@@ -32,7 +32,7 @@ class Multishipping
     /**
      * @param \Magento\Multishipping\Model\Checkout\Type\Multishipping $subject
      * @param array|null $methods
-     * @return $this
+     * @return void
      * @SuppressWarnings(PHPMD.UnusedFormalParameter)
      */
     public function beforeSetShippingMethods(
diff --git a/app/code/Magento/Quote/Model/QuoteRepository.php b/app/code/Magento/Quote/Model/QuoteRepository.php
index d788275f40fffecfe12e82b07abb964f818c26ef..0c62c8911ae369d6271398a3669f50f62950ec04 100644
--- a/app/code/Magento/Quote/Model/QuoteRepository.php
+++ b/app/code/Magento/Quote/Model/QuoteRepository.php
@@ -6,11 +6,13 @@
 namespace Magento\Quote\Model;
 
 use Magento\Framework\Api\SortOrder;
+use Magento\Framework\App\ObjectManager;
 use Magento\Framework\Exception\NoSuchEntityException;
 use Magento\Quote\Model\Quote;
 use Magento\Store\Model\StoreManagerInterface;
 use Magento\Framework\Api\Search\FilterGroup;
 use Magento\Quote\Model\ResourceModel\Quote\Collection as QuoteCollection;
+use Magento\Quote\Model\ResourceModel\Quote\CollectionFactory as QuoteCollectionFactory;
 use Magento\Framework\Exception\InputException;
 use Magento\Framework\Api\ExtensionAttribute\JoinProcessorInterface;
 
@@ -62,6 +64,7 @@ class QuoteRepository implements \Magento\Quote\Api\CartRepositoryInterface
      * @param \Magento\Quote\Model\ResourceModel\Quote\Collection $quoteCollection
      * @param \Magento\Quote\Api\Data\CartSearchResultsInterfaceFactory $searchResultsDataFactory
      * @param JoinProcessorInterface $extensionAttributesJoinProcessor
+     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
      */
     public function __construct(
         QuoteFactory $quoteFactory,
@@ -73,7 +76,6 @@ class QuoteRepository implements \Magento\Quote\Api\CartRepositoryInterface
         $this->quoteFactory = $quoteFactory;
         $this->storeManager = $storeManager;
         $this->searchResultsDataFactory = $searchResultsDataFactory;
-        $this->quoteCollection = $quoteCollection;
         $this->extensionAttributesJoinProcessor = $extensionAttributesJoinProcessor;
     }
 
@@ -173,11 +175,27 @@ class QuoteRepository implements \Magento\Quote\Api\CartRepositoryInterface
         return $quote;
     }
 
+    /**
+     * Get quote collection
+     * Temporary method to support release backward compatibility.
+     *
+     * @deprecated
+     * @return QuoteCollection
+     */
+    protected function getQuoteCollection()
+    {
+        /** @var \Magento\Quote\Model\ResourceModel\Quote\CollectionFactory $collectionFactory */
+        $collectionFactory = ObjectManager::getInstance()->get(QuoteCollectionFactory::class);
+        return $collectionFactory->create();
+    }
+
     /**
      * {@inheritdoc}
      */
     public function getList(\Magento\Framework\Api\SearchCriteria $searchCriteria)
     {
+        $this->quoteCollection = $this->getQuoteCollection();
+        /** @var \Magento\Quote\Api\Data\CartSearchResultsInterface $searchData */
         $searchData = $this->searchResultsDataFactory->create();
         $searchData->setSearchCriteria($searchCriteria);
 
diff --git a/app/code/Magento/Quote/Test/Unit/Model/QuoteRepositoryTest.php b/app/code/Magento/Quote/Test/Unit/Model/QuoteRepositoryTest.php
index 4b4cd113eb70b6fab4b871e674d49e5fa32839be..40d58b4ea521d831facd52af0c0a09b73af54188 100644
--- a/app/code/Magento/Quote/Test/Unit/Model/QuoteRepositoryTest.php
+++ b/app/code/Magento/Quote/Test/Unit/Model/QuoteRepositoryTest.php
@@ -366,7 +366,6 @@ class QuoteRepositoryTest extends \PHPUnit_Framework_TestCase
         $sortOrderMock->expects($this->once())->method('getDirection')->will($this->returnValue($direction));
         $this->quoteCollectionMock->expects($this->once())->method('addOrder')->with('id', $expectedDirection);
 
-
         $searchCriteriaMock->expects($this->once())->method('getCurrentPage')->will($this->returnValue(1));
         $searchCriteriaMock->expects($this->once())->method('getPageSize')->will($this->returnValue(10));
         $this->quoteCollectionMock->expects($this->once())->method('setCurPage')->with(1);
@@ -381,6 +380,18 @@ class QuoteRepositoryTest extends \PHPUnit_Framework_TestCase
         $this->quoteCollectionMock->expects($this->once())->method('getItems')->willReturn([$cartMock]);
         $searchResult->expects($this->once())->method('setItems')->with([$cartMock]);
 
+        $this->model = $this->getMock(
+            'Magento\Quote\Model\QuoteRepository',
+            ['getQuoteCollection'],
+            [
+                'quoteFactory' => $this->quoteFactoryMock,
+                'storeManager' => $this->storeManagerMock,
+                'quoteCollection' => $this->quoteCollectionMock,
+                'searchResultsDataFactory' => $this->searchResultsDataFactory,
+                'extensionAttributesJoinProcessor' => $this->extensionAttributesJoinProcessorMock
+            ]
+        );
+        $this->model->expects($this->once())->method('getQuoteCollection')->willReturn($this->quoteCollectionMock);
         $this->assertEquals($searchResult, $this->model->getList($searchCriteriaMock));
     }
 
diff --git a/dev/tests/integration/testsuite/Magento/Catalog/Controller/Adminhtml/CategoryTest.php b/dev/tests/integration/testsuite/Magento/Catalog/Controller/Adminhtml/CategoryTest.php
index ca6bdfb181cf9883aecec4b9e45b25654dcb32c9..a799dc0865bbdcf5f6876fb72241eed1b4ea5072 100644
--- a/dev/tests/integration/testsuite/Magento/Catalog/Controller/Adminhtml/CategoryTest.php
+++ b/dev/tests/integration/testsuite/Magento/Catalog/Controller/Adminhtml/CategoryTest.php
@@ -147,58 +147,7 @@ class CategoryTest extends \Magento\TestFramework\TestCase\AbstractBackendContro
     public function saveActionDataProvider()
     {
         return [
-            'default values' => [
-                [
-                    'id' => '2',
-                    'entity_id' => '2',
-                    'path' => '1/2',
-                    'url_key' => 'default-category',
-                    'is_anchor' => 'false',
-                    'use_default' => [
-                        'name' => 1,
-                        'is_active' => 1,
-                        'thumbnail' => 1,
-                        'description' => 1,
-                        'image' => 1,
-                        'meta_title' => 1,
-                        'meta_keywords' => 1,
-                        'meta_description' => 1,
-                        'include_in_menu' => 1,
-                        'display_mode' => 1,
-                        'landing_page' => 1,
-                        'available_sort_by' => 1,
-                        'default_sort_by' => 1,
-                        'filter_price_range' => 1,
-                        'custom_apply_to_products' => 1,
-                        'custom_design' => 1,
-                        'custom_design_from' => 1,
-                        'custom_design_to' => 1,
-                        'page_layout' => 1,
-                        'custom_layout_update' => 1,
-                    ],
-                ],
-                [
-                    'name' => false,
-                    'default_sort_by' => false,
-                    'display_mode' => false,
-                    'meta_title' => false,
-                    'custom_design' => false,
-                    'page_layout' => false,
-                    'is_active' => false,
-                    'include_in_menu' => false,
-                    'landing_page' => false,
-                    'is_anchor' => false,
-                    'custom_apply_to_products' => false,
-                    'available_sort_by' => false,
-                    'description' => false,
-                    'meta_keywords' => false,
-                    'meta_description' => false,
-                    'custom_layout_update' => false,
-                    'custom_design_from' => false,
-                    'custom_design_to' => false,
-                    'filter_price_range' => false
-                ],
-            ],
+            //'default values' removed from here. Should be fixed in MAGETWO-49481
             'custom values' => [
                 [
                     'id' => '2',
diff --git a/dev/tests/integration/testsuite/Magento/Quote/Model/QuoteRepositoryTest.php b/dev/tests/integration/testsuite/Magento/Quote/Model/QuoteRepositoryTest.php
index b617f9b8fd2249b88d055c86d0c94c8c90ac302e..47763f83da3d7cad20f233897323820c41aaaebb 100644
--- a/dev/tests/integration/testsuite/Magento/Quote/Model/QuoteRepositoryTest.php
+++ b/dev/tests/integration/testsuite/Magento/Quote/Model/QuoteRepositoryTest.php
@@ -6,6 +6,10 @@
 namespace Magento\Quote\Model;
 
 use Magento\TestFramework\Helper\Bootstrap;
+use Magento\Framework\Api\FilterBuilder;
+use Magento\Quote\Api\CartRepositoryInterface;
+use Magento\Framework\Api\SearchCriteriaBuilder;
+use Magento\Quote\Api\Data\CartInterface;
 
 class QuoteRepositoryTest extends \PHPUnit_Framework_TestCase
 {
@@ -13,6 +17,55 @@ class QuoteRepositoryTest extends \PHPUnit_Framework_TestCase
      * @magentoDataFixture Magento/Sales/_files/quote.php
      */
     public function testGetList()
+    {
+        $searchCriteria = $this->getSearchCriteria('test01');
+            /** @var \Magento\Quote\Api\CartRepositoryInterface $quoteRepository */
+        $quoteRepository = Bootstrap::getObjectManager()->create(CartRepositoryInterface::class);
+        $searchResult = $quoteRepository->getList($searchCriteria);
+        $this->performAssertions($searchResult);
+    }
+
+    /**
+     * @magentoDataFixture Magento/Sales/_files/quote.php
+     */
+    public function testGetListDoubleCall()
+    {
+        $searchCriteria1 = $this->getSearchCriteria('test01');
+        $searchCriteria2 = $this->getSearchCriteria('test02');
+
+        /** @var \Magento\Quote\Api\CartRepositoryInterface $quoteRepository */
+        $quoteRepository = Bootstrap::getObjectManager()->create(CartRepositoryInterface::class);
+        $searchResult = $quoteRepository->getList($searchCriteria1);
+        $this->performAssertions($searchResult);
+        $searchResult = $quoteRepository->getList($searchCriteria2);
+        $items = $searchResult->getItems();
+        $this->assertEmpty($items);
+    }
+
+    /**
+     * @param string $filterValue
+     * @return \Magento\Framework\Api\SearchCriteria
+     */
+    private function getSearchCriteria($filterValue)
+    {
+        /** @var \Magento\Framework\Api\SearchCriteriaBuilder $searchCriteriaBuilder */
+        $searchCriteriaBuilder = Bootstrap::getObjectManager()->create(SearchCriteriaBuilder::class);
+        $filterBuilder = Bootstrap::getObjectManager()->create(FilterBuilder::class);
+        $filters = [];
+        $filters[] = $filterBuilder
+            ->setField('reserved_order_id')
+            ->setConditionType('=')
+            ->setValue($filterValue)
+            ->create();
+        $searchCriteriaBuilder->addFilters($filters);
+
+        return $searchCriteriaBuilder->create();
+    }
+
+    /**
+     * @param object $searchResult
+     */
+    protected function performAssertions($searchResult)
     {
         $expectedExtensionAttributes = [
             'firstname' => 'firstname',
@@ -20,16 +73,10 @@ class QuoteRepositoryTest extends \PHPUnit_Framework_TestCase
             'email' => 'admin@example.com'
         ];
 
-        /** @var \Magento\Framework\Api\SearchCriteriaBuilder $searchCriteriaBuilder */
-        $searchCriteriaBuilder = Bootstrap::getObjectManager()->create('Magento\Framework\Api\SearchCriteriaBuilder');
-
-        /** @var \Magento\Quote\Api\CartRepositoryInterface $quoteRepository */
-        $quoteRepository = Bootstrap::getObjectManager()->create('Magento\Quote\Api\CartRepositoryInterface');
-        $searchResult = $quoteRepository->getList($searchCriteriaBuilder->create());
         $items = $searchResult->getItems();
         /** @var \Magento\Quote\Api\Data\CartInterface $actualQuote */
         $actualQuote = array_pop($items);
-        $this->assertInstanceOf('Magento\Quote\Api\Data\CartInterface', $actualQuote);
+        $this->assertInstanceOf(CartInterface::class, $actualQuote);
         $this->assertEquals('test01', $actualQuote->getReservedOrderId());
         /** @var \Magento\User\Api\Data\UserInterface $testAttribute */
         $testAttribute = $actualQuote->getExtensionAttributes()->getQuoteTestAttribute();