Improved the check of inputs before ExecuteData is called
Improved the check of inputs before ExecuteData is called

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