check if same node before adding virtual link
check if same node before adding virtual link

MASKOR/rtabmap,markusgrotz/rtabmap,markusgrotz/rtabmap,chen0510566/rtabmap,chen0510566/rtabmap,markusgrotz/rtabmap,MASKOR/rtabmap,srmanikandasriram/rtabmap,srmanikandasriram/rtabmap,MASKOR/rtabmap,srmanikandasriram/rtabmap,chen0510566/rtabmap