BUG: Immediately return if input is empty (instead of crashing)
BUG: Immediately return if input is empty (instead of crashing)

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