Fix a seg fault.  Better error handling
Fix a seg fault.  Better error handling

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