BUG: forgot to put quotes around some variables, which caused CMake to choke when those variables were empty
BUG: forgot to put quotes around some variables, which caused CMake to choke when those variables were empty

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