Licence filter is always blank in LH column

The licence filter in the LH column always shows the message "There are no filters for this search" even though there are multiple licences in use.  

This seems to be the case on all 2.0 sites I've tested (SA, beta, master and demo) 

![search for a dataset - ckan beta](https://f.cloud.github.com/assets/199920/445051/67b07958-b1b2-11e2-97eb-a7b6dc26552d.png)