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GatherV(vtkDataObject*) now handles NULL correctly.

Utkarsh Ayachit requested to merge utkarsh.ayachit/vtk:handle_null_dataset into master

If vtkCommunicator::GatherV(vtkDataObject*,...) was passed a NULL, it would just skip. That could cause deadlocks in parallel is all ranks didn't have NULL datasets. This change ensures that the communication doesn't deadlock for NULL datasets.

This addresses paraview/paraview#16779 (closed).

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