Decide what to do if there's a qualifier with an unsupported property.
For example - say we're supporting features, color, wears, part, quantity as depicts qualifiers initially, and then we drop support for part but there's data in there already.
ATM this breaks the javascript on the File page. Obvs that shouldn't happen, and needs to be fixed, but what *should* happen?
@Ramsey-WMF @PDrouin-WMF ? Any thoughts?