Fix useUnreadNotifications exploding with falsey room, like in notif panel (#10030)

src/components/views/rooms/EventTile.tsx

@@ -1348,7 +1348,7 @@ export class UnwrappedEventTile extends React.Component<EventTileProps, IState>
                         )}
 
                         {msgOption}
-                        <UnreadNotificationBadge room={room} threadId={this.props.mxEvent.getId()} />
+                        <UnreadNotificationBadge room={room || undefined} threadId={this.props.mxEvent.getId()} />
                     </>,
                 );
             }

src/components/views/rooms/NotificationBadge/UnreadNotificationBadge.tsx

@@ -21,7 +21,7 @@ import { useUnreadNotifications } from "../../../../hooks/useUnreadNotifications
 import { StatelessNotificationBadge } from "./StatelessNotificationBadge";
 
 interface Props {
-    room: Room;
+    room?: Room;
     threadId?: string;
 }