[vtkusers] GetFieldData segfaults

[David Doria]

With some models, the following call causes a segmentation fault:
vtkSmartPointer<vtkFieldData> FieldData = polydata->GetFieldData();

I was originally calling
vtkSmartPointer<vtkDoubleArray> ScannerLocationArray =
vtkDoubleArray::SafeDownCast(polydata->GetFieldData()->GetArray("ScannerLocation"));

but I thought the ->GetArray() might be failing if GetFieldData returned
null, so I tried to get the entire field data, and it still crashes.

Any thoughts?

Thanks,

David
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