message: Don't use reply if undefined
diff: @@ -1270,9 +1270,11 @@ MatrixHandler.prototype._sendIrcAction = Promise.coroutine(
  let cacheBody = text;
  if (event.content["m.relates_to"] && event.content["m.relates_to"]["m.in_reply_to"]) {
  const reply = yield this._textForReplyEvent(event, ircRoom);
  + if (reply !== undefined) {
  ircAction.text = text = reply.formatted;
  cacheBody = reply.reply;
  }
  + }
  this._eventCache.set(event.event_id, {
  body: cacheBody.substr(0, REPLY_SOURCE_MAX_LENGTH),
  sender: event.sender
  