fix bug in robot model publisher callback
fix bug in robot model publisher callback

need to reassign defaultRobotModel to the new model.
also, now deleting the previous model

empireryan/director,openhumanoids/director,patmarion/director,rdeits/director,edowson/director,manuelli/director,patmarion/director,empireryan/director,RobotLocomotion/director,rdeits/director,rdeits/director,openhumanoids/director,edowson/director,patmarion/director,gizatt/director,RussTedrake/director,manuelli/director,RussTedrake/director,mitdrc/director,patmarion/director,gizatt/director,empireryan/director,RussTedrake/director,openhumanoids/director,RobotLocomotion/director,mitdrc/director,mitdrc/director,mithrandir123/director,RobotLocomotion/director,mitdrc/director,mithrandir123/director,empireryan/director,rdeits/director,gizatt/director,gizatt/director,patmarion/director,RussTedrake/director,RobotLocomotion/director,gizatt/director,empireryan/director,RobotLocomotion/director,manuelli/director,mithrandir123/director,mithrandir123/director,mitdrc/director,manuelli/director,rdeits/director,edowson/director,edowson/director,openhumanoids/director,edowson/director,mithrandir123/director,manuelli/director,openhumanoids/director,RussTedrake/director