fontyourface_ui doesn't play well with jquery_update

To reproduce:
- enable some fonts;
- assign one of them either to 'standard text' or 'all headers' (these are the options containing comma);
- so far, everything is OK;
- enable jQuery Update;
- go back to admin/appearance/fontyourface and see it break down like in attached screenshot (I expanded the error message there).

Patch coming.