Tiny tweak, fixes JS error when adding RSS to an empty list of active folders.
Tiny tweak, fixes JS error when adding RSS to an empty list of active folders.

pombredanne/paperpile,pombredanne/paperpile,pombredanne/paperpile,jondo/paperpile,pombredanne/paperpile,jondo/paperpile,pombredanne/paperpile,jondo/paperpile,jondo/paperpile,jondo/paperpile