Get rid of ghost level array when there are no ghost levels requested.
Get rid of ghost level array when there are no ghost levels requested.

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