Can't search across groups

I took the following steps:
* on the groups page: https://go.vumi.org/contacts/groups/ , I have a group called "Ben"
* in the search box at the top of the groups page I search for "Ben"
* after I click the search box, nothing happens (i.e. I am shown the same page)

Additional notes:
* the same solution should also apply to the smart groups page: https://go.vumi.org/contacts/groups/smart/
* Group search is a requirement for Rachel at Sisi Ni Amani.

![screen shot 2013-08-19 at 1 21 35 pm](https://f.cloud.github.com/assets/1521387/985561/971b87f8-08c1-11e3-966a-44fa1173284a.png)