fix: Remove grey bar for TableElement component when `metadata` is empty (#16054)

* create serialize json function

* remove grey space with no metadata

* remove console log

superset-frontend/src/SqlLab/components/TableElement.tsx

@@ -133,7 +133,8 @@ const TableElement = ({ table, actions, ...props }: TableElementProps) => {
       ));
     }
 
-    if (!partitions && !metadata) {
+    if (!partitions && (!metadata || !metadata.length)) {
+      // hide partition and metadata card view
       return null;
     }