message: mavlink_command: only print progress if valid
diff: @@ -185,8 +185,10 @@ void MavlinkCommands::receive_command_ack(mavlink_message_t message)
  break;
  case MAV_RESULT_IN_PROGRESS:
  + if ((int)command_ack.progress != 255) {
  Debug() << "progress: " << (int)command_ack.progress
  << " % (" << work.mavlink_command << ").";
  + }
  // FIXME: We can only call callbacks with promises once, so let's not do it
  // on IN_PROGRESS.
  //if (work.callback) {
  