Fix right panel for peeking rooms

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/stores/WidgetStore.ts

@@ -118,6 +118,7 @@ export default class WidgetStore extends AsyncStoreWithClient<IState> {
     }
 
     private loadRoomWidgets(room: Room) {
+        if (!room) return;
         const roomInfo = this.roomMap.get(room.roomId);
         roomInfo.widgets = [];
         this.generateApps(room).forEach(app => {