Add small change on category indexing for Enterprise Edition (#1136)

Author: damcou

Helper/Entity/CategoryHelper.php

@@ -465,9 +465,8 @@ private function getCategoryKeyId($categoryId)
 
         if ($this->getCorrectIdColumn() === 'row_id') {
             $category = $this->getCategoryById($categoryId);
-            if ($category) {
-                $categoryKeyId = $category->getRowId();
-            }
+
+            return $category ? $category->getRowId() : null;
         }
 
         return $categoryKeyId;