MAGETWO-83977: Handle empty or incorrect lines in a language CSV #12304

 - Merge Pull Request magento/magento2#12304 from FreekVandeursen/magento2:bugfix/language-pack-empty-line
 - Merged commits:
   1. 470c257f
   2. 3d1d0274
   3. 723452c7

dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_gb/1.csv

 four and 75/100,4.75
-four and 5/10,4.50
+four and 5/10,4.50
\ No newline at end of file
+

lib/internal/Magento/Framework/App/Language/Dictionary.php

@@ -193,7 +193,9 @@ class Dictionary
             foreach ($foundCsvFiles as $foundCsvFile) {
                 $file = $directoryRead->openFile($foundCsvFile);
                 while (($row = $file->readCsv()) !== false) {
-                    $result[$row[0]] = $row[1];
+                    if (is_array($row) && count($row) > 1) {
+                        $result[$row[0]] = $row[1];
+                    }
                 }
             }
         }