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Fix crash in polygon "create vertices" called from CMB.

David Thompson requested to merge dcthomp/smtk:fix-crashing-ops into master
  • This fixes smtk::attribute::Attribute::isValid() to test each of its items as well as its references.
  • This fixes the templated isInvalid function called during validity testing to better handle the case when the maximum number of values in the item's definition is zero.
  • Don't require attribute validity in the qtModelOperationWidget initialization code as items without defaults may not be valid at that point.

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