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Mathieu Westphal (Kitware) authored
CellCenters had incorrect behavior with vtkEmptyCells: the filter used to replace empty cells by uninitialized points and did not copy cell data to point data in this case. This change makes sure that vtkCellCenter do not create point for empty cells and ensure that point data are correctly mapped to input cell data. Code has also been modernized. Fix #17446
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