Prop type check repair (#2919)

* repair intent check wraning

* change doublequote to singlequote, add semicolon

* optimized code

* modify type-check wraning

frontend/src/components/dialog/create-group-dialog.js

@@ -22,7 +22,7 @@ class CreateGroupDialog extends React.Component {
     if (this.state.errorMsg) {
       this.setState({
         errorMsg: ''
-      })
+      });
     }
   }