ENH: fix for bug #1657 (copied from main tree) - clicking Label Point Ids check box should not crash the application
ENH: fix for bug #1657 (copied from main tree) - clicking Label Point Ids check box should not crash the application

gram526/VTK,hendradarwin/VTK,sankhesh/VTK,gram526/VTK,mspark93/VTK,demarle/VTK,gram526/VTK,ashray/VTK-EVM,biddisco/VTK,jmerkow/VTK,SimVascular/VTK,arnaudgelas/VTK,collects/VTK,candy7393/VTK,sumedhasingla/VTK,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,msmolens/VTK,mspark93/VTK,msmolens/VTK,aashish24/VTK-old,mspark93/VTK,collects/VTK,SimVascular/VTK,keithroe/vtkoptix,daviddoria/PointGraphsPhase1,sankhesh/VTK,mspark93/VTK,johnkit/vtk-dev,biddisco/VTK,msmolens/VTK,collects/VTK,jeffbaumes/jeffbaumes-vtk,mspark93/VTK,sumedhasingla/VTK,johnkit/vtk-dev,collects/VTK,sgh/vtk,keithroe/vtkoptix,sankhesh/VTK,biddisco/VTK,spthaolt/VTK,berendkleinhaneveld/VTK,spthaolt/VTK,keithroe/vtkoptix,Wuteyan/VTK,demarle/VTK,ashray/VTK-EVM,sgh/vtk,arnaudgelas/VTK,daviddoria/PointGraphsPhase1,msmolens/VTK,ashray/VTK-EVM,johnkit/vtk-dev,biddisco/VTK,johnkit/vtk-dev,jmerkow/VTK,ashray/VTK-EVM,candy7393/VTK,cjh1/VTK,gram526/VTK,collects/VTK,gram526/VTK,candy7393/VTK,demarle/VTK,keithroe/vtkoptix,naucoin/VTKSlicerWidgets,sgh/vtk,aashish24/VTK-old,biddisco/VTK,hendradarwin/VTK,ashray/VTK-EVM,keithroe/vtkoptix,berendkleinhaneveld/VTK,spthaolt/VTK,sgh/vtk,naucoin/VTKSlicerWidgets,jeffbaumes/jeffbaumes-vtk,candy7393/VTK,mspark93/VTK,candy7393/VTK,Wuteyan/VTK,berendkleinhaneveld/VTK,ashray/VTK-EVM,demarle/VTK,aashish24/VTK-old,naucoin/VTKSlicerWidgets,spthaolt/VTK,jmerkow/VTK,gram526/VTK,daviddoria/PointGraphsPhase1,johnkit/vtk-dev,cjh1/VTK,sgh/vtk,collects/VTK,arnaudgelas/VTK,mspark93/VTK,ashray/VTK-EVM,jmerkow/VTK,sankhesh/VTK,hendradarwin/VTK,jeffbaumes/jeffbaumes-vtk,SimVascular/VTK,msmolens/VTK,cjh1/VTK,berendkleinhaneveld/VTK,SimVascular/VTK,daviddoria/PointGraphsPhase1,Wuteyan/VTK,cjh1/VTK,demarle/VTK,cjh1/VTK,Wuteyan/VTK,msmolens/VTK,cjh1/VTK,sankhesh/VTK,SimVascular/VTK,berendkleinhaneveld/VTK,ashray/VTK-EVM,mspark93/VTK,naucoin/VTKSlicerWidgets,jmerkow/VTK,keithroe/vtkoptix,SimVascular/VTK,aashish24/VTK-old,hendradarwin/VTK,SimVascular/VTK,biddisco/VTK,sumedhasingla/VTK,demarle/VTK,spthaolt/VTK,SimVascular/VTK,daviddoria/PointGraphsPhase1,demarle/VTK,arnaudgelas/VTK,daviddoria/PointGraphsPhase1,Wuteyan/VTK,spthaolt/VTK,candy7393/VTK,naucoin/VTKSlicerWidgets,sgh/vtk,candy7393/VTK,msmolens/VTK,demarle/VTK,candy7393/VTK,Wuteyan/VTK,gram526/VTK,hendradarwin/VTK,aashish24/VTK-old,Wuteyan/VTK,keithroe/vtkoptix,naucoin/VTKSlicerWidgets,johnkit/vtk-dev,johnkit/vtk-dev,jeffbaumes/jeffbaumes-vtk,msmolens/VTK,gram526/VTK,hendradarwin/VTK,sumedhasingla/VTK,jeffbaumes/jeffbaumes-vtk,jmerkow/VTK,arnaudgelas/VTK,sumedhasingla/VTK,arnaudgelas/VTK,aashish24/VTK-old,sumedhasingla/VTK,sankhesh/VTK,sumedhasingla/VTK,biddisco/VTK,jmerkow/VTK,sankhesh/VTK,sumedhasingla/VTK,spthaolt/VTK,sankhesh/VTK,hendradarwin/VTK,keithroe/vtkoptix,jeffbaumes/jeffbaumes-vtk,jmerkow/VTK