BUG: Fixes an unrecoverable for missing types array
BUG: Fixes an unrecoverable for missing types array

If there aren't cells the writer doesn't put a types array, so we
shouldn't error out completely.

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