Bug 1028681 - [Collection app] Contacts and Phone apps cannot be added to Smart Collections

https://bugzilla.mozilla.org/show_bug.cgi?id=1028681
Yeah, I often get confused by it, but essentially these are not *real* elements. These are marionette element objects, which look like real elements, but really aren't. For example, they do not have a classList property.

getAttribute('className') should be fine here, I think getAttribute('class') might also work? Though I was just copying another test :)