BUG: fix for empty data
BUG: fix for empty data

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