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Fix vtkXMLUnstructuredGridReader not importing .vtu with NULL cell array

Bengt Rosenberger requested to merge Bengt/vtk:xml-unstructured-reader-allow-null-pointsandcells into master

Fix issue #19349 (closed): A freshly initialized unstructured grid may be written without DataArray child nodes in the Point and Cells elements but vtkXMLUnstructuredGridReader and vtkXMLUnstructuredDataReader always expected them to have child nodes. Made it only an error if the number of point or cells is not 0, respectively. Added test case.

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