message: fix status err when kill usr2 and no set task_num
diff: @@ -391,6 +391,7 @@ static int swManager_loop(swServer *serv)
  if (serv->task_worker_num == 0)
  {
  swWarn("cannot reload task workers, task workers is not started");
  + ManagerProcess.reloading = false;
  continue;
  }
  swInfo("Server is reloading task workers now");
  