vtkHyperTreeGridCellCenters fails on composite dataset.
Using pv_insitu_0.vtm:
ERROR: In /Users/stam/GitParaVTK/paraview/VTK/Common/DataModel/vtkDataSet.cxx, line 435
vtkPolyData (0x7f9aca730160): Point array cpu with 1 components, only has 0 tuples but there are 66904 points