message: adding log message
  for ExecutionModelInterpolate
diff: @@ -87,6 +87,7 @@ void ExecutionModelInterpolate::Execute(const float& new_world_time,
  SetLastTrajectory(trajectory);
  if(GetExecutionStatus() == ExecutionStatus::INVALID) {
  + LOG(INFO) << "ExecutionStatus was and still is invalid." << std::endl;
  return;
  }
  