I think the idea with this was "If there's no kit ID to load, then there are no fonts to load. Either `true` or `false` for support for a null kit could be considered correct." I guess we decided that "any browser supports loading 0 web fonts" made more sense than "no browsers support loading 0 web fonts".

Does that make sense? This is a pretty big edge case, so I don't think it's that big of a deal either way.