[vtkusers] Allowing empty data arrays as field attributes?

[CharlesB]

Hello,

If I have a DataSet with one of its DataArray being empty (those things
happen), I get a crash when going through CopyData during a pipeline
execution, precisely in the loop of vtkDataSetAttributes::CopyData, called
in UnstructuredGridGeometryFilter.

Is it a bug, or is it required that the user doesn't create empty arrays? I
use VTK 7.0.0.

Best regards
Charles
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