fix: formal attributes were not being included in all attributes
Merge pull request #61 from satra/fix/formal_attributes

Fixed: None values for empty formal attributes in PROV-N output (fixed #60)
Merge remote-tracking branch 'upstream/master' into enh/rdf-1.x

* upstream/master:
  fix: formal attributes were not being included in all attributes
Fixed #60 but no need to touch ProvRecord.formal_attributes (as per #61)
Merge remote-tracking branch 'upstream/master' into enh/rdf-1.x

* upstream/master:
  Fixed #60 but no need to touch ProvRecord.formal_attributes (as per #61)
current state