message: Allow EventTile to be rendered with mock events
diff: @@ -478,7 +478,7 @@ export default class EventTile extends React.Component<IProps, IState> {
  }
  const room = this.context.getRoom(this.props.mxEvent.getRoomId());
  - room.on(ThreadEvent.New, this.onNewThread);
  + room?.on(ThreadEvent.New, this.onNewThread);
  }
  private updateThread = (thread) => {
  @@ -522,7 +522,7 @@ export default class EventTile extends React.Component<IProps, IState> {
  }
  const room = this.context.getRoom(this.props.mxEvent.getRoomId());
  - room.off(ThreadEvent.New, this.onNewThread);
  + room?.off(ThreadEvent.New, this.onNewThread);
  }
  componentDidUpdate(prevProps, prevState, snapshot) {
  @@ -553,7 +553,7 @@ export default class EventTile extends React.Component<IProps, IState> {
  * when we are at the sync stage
  */
  const room = MatrixClientPeg.get().getRoom(this.props.mxEvent.getRoomId());
  - const thread = room.threads.get(this.props.mxEvent.getId());
  + const thread = room?.threads.get(this.props.mxEvent.getId());
  if (thread && !thread.ready) {
  thread.addEvent(this.props.mxEvent, true);
  