MAGETWO-95825: [Magento cloud] - Images revert to default placeholder on import

- Removing invalid image attributes from row

Author: vprohorov

app/code/Magento/CatalogImportExport/Model/Import/Product.php

@@ -1782,6 +1782,7 @@ protected function _saveProducts()
                             if ($uploadedFile) {
                                 $uploadedImages[$columnImage] = $uploadedFile;
                             } else {
+                                unset($rowData[$column]);
                                 $this->addRowError(
                                     ValidatorInterface::ERROR_MEDIA_URL_NOT_ACCESSIBLE,
                                     $rowNum,