BUG: Fail gracefully when GLSL can't compile.
BUG: Fail gracefully when GLSL can't compile.

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