ENH: fix for test empty input
ENH: fix for test empty input

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