don't compare old to new if old doesn't exist
don't compare old to new if old doesn't exist

jfhernandeze/revisionable,VentureCraft/revisionable,SpaceGazebo/RevisionableTraitL5,anteriovieira/revisionable,vladutcornel/revisionable,anggras/revisionable,spira/revisionable,gratif/revisionable