message: Add a 441-error-msg in AutoUpdateManager
diff: @@ -206,6 +206,8 @@ void AutoUpdateManager::onUpdateTaskFinished(bool success)
  error_msg = tr("Permission Error!");
  } else if (task->httpErrorCode() == 401) {
  error_msg = tr("Authorization expired");
  + } else if (task->httpErrorCode() == 441) {
  + error_msg = tr("File does not exist");
  } else {
  error_msg = task->errorString();
  }
  