message: fix ghost joining room on unknown guild member
diff: @@ -707,7 +707,11 @@ export class DiscordBot {
  log.error("DiscordBot", "Failed to send message into room.", e);
  return;
  }
  + if (msg.member) {
  await this.userSync.JoinRoom(msg.member, room);
  + } else {
  + await intent.join(room);
  + }
  res = await trySend();
  await afterSend(res);
  }
  