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Fix HyperTree->GetByLevel... and add test xml htg writer

Jérôme Dubois requested to merge JeromeDuboisPro/vtk:add-test-XML-HTG-writer into master

When writing HTG with Paraview ot VTK, HyperTree->GetByLevelForWriter is called, and when a HyperTreeGrid has a mask of size zero, then GetByLevel... crashes. Added a test on the mask pointer and the size of the mask, plus provided a python test to ensure that the writer does not crash in version 1.x, mode appended.

Edited by Jérôme Dubois

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