AC-6958: admin product import improvements

Author: sreenia806

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

@@ -1632,8 +1632,10 @@ protected function _saveProducts()
                     $bunch[$rowNum][self::URL_KEY] = $rowData[self::URL_KEY] = $urlKey;
                 }
 
-                // remove null byte character
-                $rowData[self::COL_NAME] = preg_replace(self::COL_NAME_FORMAT, '', $rowData[self::COL_NAME]);
+                if (!empty($rowData[self::COL_NAME])) {
+                    // remove null byte character
+                    $rowData[self::COL_NAME] = preg_replace(self::COL_NAME_FORMAT, '', $rowData[self::COL_NAME]);
+                }
 
                 $rowSku = $rowData[self::COL_SKU];
                 $rowSkuNormalized = mb_strtolower($rowSku);