message: Null-check the widget before continuing
  Deleted widgets should return isPinned=false
diff: @@ -158,7 +158,8 @@ export default class WidgetStore extends AsyncStoreWithClient<IState> {
  let pinned = roomInfo && roomInfo.pinned[widgetId];
  // Jitsi widgets should be pinned by default
  - if (pinned === undefined && WidgetType.JITSI.matches(this.widgetMap.get(widgetId).type)) pinned = true;
  + const widget = this.widgetMap.get(widgetId);
  + if (pinned === undefined && WidgetType.JITSI.matches(widget?.type)) pinned = true;
  return pinned;
  }
  