Check if we are already initialized before calling initialize.
Check if we are already initialized before calling initialize.

Thanks to Utkarsh for helping track this down.

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