`sum_per_block` doesn't work
- Open can.ex2, all variables, apply and go to last timestep.
- apply Python calculator as follows:
It fails as follows:
Traceback (most recent call last):
File "<string>", line 4, in <module>
File "/home/utkarsh/Kitware/ParaView3/ParaViewBin-Qt5/lib/site-packages/paraview/calculator.py", line 205, in execute
output.GetAttributes(retVal.Association).append(\
File "/home/utkarsh/Kitware/ParaView3/ParaViewBin-Qt5/lib/site-packages/vtk/numpy_interface/dataset_adapter.py", line 964, in GetAttributes
return CompositeDataSetAttributes(self, type)
File "/home/utkarsh/Kitware/ParaView3/ParaViewBin-Qt5/lib/site-packages/vtk/numpy_interface/dataset_adapter.py", line 768, in __init__
self.__determine_arraynames()
File "/home/utkarsh/Kitware/ParaView3/ParaViewBin-Qt5/lib/site-packages/vtk/numpy_interface/dataset_adapter.py", line 774, in __determine_arraynames
dsa = dataset.GetAttributes(self.Association)
File "/home/utkarsh/Kitware/ParaView3/ParaViewBin-Qt5/lib/site-packages/vtk/numpy_interface/dataset_adapter.py", line 904, in GetAttributes
return DataSetAttributes(self.VTKObject.GetAttributes(type), self, type)
TypeError: GetAttributes argument 1: an integer is required (got type NoneType)