message: Forgot to have placeRobot() return if a bulldozer is placed on a mine.
diff: @@ -796,6 +796,7 @@ void MapViewState::placeRobot()
  if (tile->mine()->depth() != mTileMap->maxDepth() || !tile->mine()->exhausted())
  {
  doAlertMessage(constants::ALERT_INVALID_ROBOT_PLACEMENT, constants::ALERT_MINE_NOT_EXHAUSTED);
  + return;
  }
  mMineOperationsWindow.hide();
  