message: Add a bit of safety around timestamp handling for threads
diff: @@ -1121,9 +1121,13 @@ export class UnwrappedEventTile extends React.Component<IProps, IState> {
  || Boolean(this.state.contextMenu));
  // Thread panel shows the timestamp of the last reply in that thread
  - const ts = this.context.timelineRenderingType !== TimelineRenderingType.ThreadsList
  + let ts = this.context.timelineRenderingType !== TimelineRenderingType.ThreadsList
  ? this.props.mxEvent.getTs()
  - : this.state.thread?.replyToEvent.getTs();
  + : this.state.thread?.replyToEvent?.getTs();
  + if (typeof ts !== "number") {
  + // Fall back to something we can use
  + ts = this.props.mxEvent.getTs();
  + }
  const messageTimestamp = <MessageTimestamp
  showRelative={this.context.timelineRenderingType === TimelineRenderingType.ThreadsList}
  