Blacklight Plugin

Hey, Jamie. I've got a bug for you to take a look at WRT the sorting. I've got two test cases for you:

1. If I go to an out of the box demo app and select a facet, like language --> Tibetan, and then sort by title, I get a 500 error. (Sorting does work if you have a search entered, just not if you only have a facet selected)

2. If I go to an out of the box demo app and search for history (five results), then limit to language:Tibetan (two results), then sort by title, I'm back to having five results. It lost my facet selection.

Something like this: https://jira.lib.virginia.edu/secure/attachment/10162/blacklight_search1a.png

Could you take a look?

Thanks!