VTK-3603 - check that prop count is the same (in case any is removed in new data)
VTK-3603 - check that prop count is the same (in case any is removed in new data)

vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk