Comment 9 for bug 851424

@Sebastian: I have 18 buttons as well, but those buttons do not reflect the contents of my collection, so most buttons do nothing:

* I do not have music that that is blues, country, disco, funk, hip-hop, metal, r&b, and soul.
   * The lens should not list these genres because they lead to zero-results.
   * Or the lens should not allow me to use filters that create zero-results
      * This probably means the UI has to clear show which filters are disabled

I have Alternative, Adult Alternative, Indie, Goth, Darkwave, DreamPop, BritPop Genres that may appear when I choose the Other genre.

The lens does not have a mapping for the World genre, so I cannot find my Irish and Bulgarian recordings

I expect the filters to list only the genres (and decades) that are in my music collection. I have only two genres from 1 decade, then there should be two genre buttons and 1 decade button.