fix: passing a non-array as children to a table will result in an error. (#6521)

* fix: fix table column data is passed into chlidren is undefined or null errorr

* chore(menu): fix menu inline demo watch not trigger

components/menu/demo/inline.vue

@@ -86,12 +86,9 @@ export default defineComponent({
     const titleClick = (e: Event) => {
       console.log('titleClick', e);
     };
-    watch(
-      () => openKeys,
-      val => {
+    watch(openKeys, val => {
       console.log('openKeys', val);
-      },
-    );
+    });
     return {
       selectedKeys,
       openKeys,

components/table/hooks/useColumns.tsx

@@ -37,7 +37,7 @@ function fillSlots<RecordType>(columns: ColumnsType<RecordType>, contextSlots: R
         () => [column.title as any],
       );
     }
-    if ('children' in cloneColumn) {
+    if ('children' in cloneColumn && Array.isArray(cloneColumn.children)) {
       cloneColumn.children = fillSlots(cloneColumn.children, contextSlots);
     }