add group new event type

src/apps/group_chat/layer.rs

@@ -260,6 +260,7 @@ async fn handle_event(
         LayerEvent::Check => {}             // nerver here.
         LayerEvent::Create(..) => {}        // nerver here.
         LayerEvent::Request(..) => {}       // nerver here.
+        LayerEvent::RequestResult(..) => {} // nerver here.
         LayerEvent::SyncReq(..) => {}       // Never here.
     }