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IÃ¢â¬â¢m not actually sure if this is exactly what youÃ¢â¬â¢re looking for. but itÃ¢â¬â¢s all about bulk updating attributes, so give it a look please.
We just released an extension Unfilled Attribute Manager that helps with filling blank attributes.
If you have any question, feel free to ask us. firstname.lastname@example.org