12.0 wiki page can add sub page (#6165)

* 00 add page.children

* 01 add delete inner page

* 02 change page indent and path

* 03 change top nav style

* 04 change svg and var name

* 05 move pages into or out folder

* 06 change codes

frontend/src/pages/wikis/wikis.js

@@ -55,10 +55,6 @@ class Wikis extends Component {
           errorMsg: Utils.getErrorMsg(error, true) // true: show login tip if 403
         });
       });
-      this.setState({
-        loading: false,
-        wikis: wikis
-      });
     }).catch((error) => {
       this.setState({
         loading: false,