ckan/ckan — pull request #1873 by joetsoi (2014-09-16 11:03:45+00:00)
Title: list of member roles disappears on add member page if you enter a user that doesn't exist 

1. create org
2. goto add member, type in a username that doesn't exist
3. validation fails, but now list of user roles is now empty.

tested on demo and locally on 2.2.1