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fix(vtkTableBasedClipDataSet): avoid segfault for no cell poly data

Julien Fausty requested to merge julien.fausty/vtk:fixClippingCrash into master

When a vtkPolyData with no cells was passed to vtkTableBasedClipDataSet::CanFullyProcessUnstructuredData this led to a segmentation fault on a vtkPolyData::GetCell.

Checking for no cells beforehand fixes this issue.

Should fix #18711 (closed)

backport

Edited by Julien Fausty

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