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vtkExtractSubsetWithSeed: handle ranks with no blocks

Utkarsh Ayachit requested to merge utkarsh.ayachit/vtk:handle-empty-blocks into master

vtkExtractSubsetWithSeed uses DIY collectives to determine when the looping is to be terminated. These collectives require that all ranks have some block otherwise the ranks with no blocks have no way to wait for other ranks to be done before following up with more work.

Fixed by ensuring we always have at least 1 block on each rank.

Addresses paraview/paraview#19391 (closed)

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