Merge pull request #1825 from magento-engcom/2.2-develop-prs

[EngCom] Public Pull Requests - 2.2-develop
 - MAGETWO-85332: Fix error loading theme configuration on PHP 7.2 #12606
 - MAGETWO-85307: 12468: Sort by Price not working on CatalogSearch Page in Magento 2 #929
 - MAGETWO-85303: magento/magento2#12582: Can't remove item description from wishlist #981
 - MAGETWO-85297: 8410: Custom Checkout Step and Shipping Step are Highlighted and Combined upon Checkout page load #975
 - MAGETWO-85290: 7467: File Put Contents file with empty content. #962