ENH: make sure value is set before using it
ENH: make sure value is set before using it

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