message: Add a layout fallback for EventTile
diff: @@ -267,7 +267,7 @@ interface IProps {
  showReactions?: boolean;
  // which layout to use
  - layout?: Layout;
  + layout: Layout;
  // whether or not to show flair at all
  enableFlair?: boolean;
  @@ -321,6 +321,7 @@ export default class EventTile extends React.Component<IProps, IState> {
  static defaultProps = {
  // no-op function because onHeightChanged is optional yet some sub-components assume its existence
  onHeightChanged: function() {},
  + layout: Layout.Group,
  };
  static contextType = MatrixClientContext;
  