message: ReactionsRowButtonTooltip: fix null dereference if emoji owner left room
diff: @@ -43,7 +43,8 @@ export default class ReactionsRowButtonTooltip extends React.PureComponent {
  if (room) {
  const senders = [];
  for (const reactionEvent of reactionEvents) {
  - const { name } = room.getMember(reactionEvent.getSender());
  + const member = room.getMember(reactionEvent.getSender());
  + const name = member ? member.name : reactionEvent.getSender();
  senders.push(name);
  }
  const shortName = unicodeToShortcode(content);
  