I think it has changed for FieldIndexes.

Yes, from UnKeywordIndex.py.... newKeywords = getattr(obj, self.id, ())

You can now make the distinction between "doesnt have that attribute" and "attribute is one of [None, '', [], ()]" within a Field Index.

Reviewing UnKeywordIndex.py, I dont see what an object should do to mean "doesnt have that attribute" "dont include me in this FieldIndex". Any suggestions? Thanks for your time,