message: fixed "CameraModel() Condition (fx > 0.0) not met! [fx=0.000000]" error on appearance-based demo
diff: @@ -895,6 +895,12 @@ rtabmap::Signature nodeDataFromROS(const rtabmap_ros::NodeData & msg)
  msg.fx.size() == msg.localTransform.size())
  {
  for(unsigned int i=0; i<msg.fx.size(); ++i)
  + {
  + if(msg.fx[i] == 0)
  + {
  + models.push_back(rtabmap::CameraModel());
  + }
  + else
  {
  models.push_back(rtabmap::CameraModel(
  msg.fx[i],
  @@ -907,6 +913,7 @@ rtabmap::Signature nodeDataFromROS(const rtabmap_ros::NodeData & msg)
  }
  }
  }
  + }
  rtabmap::Signature s(
  msg.id,
  