This isn't a huge problem but we should avoid failures when we can. I had an older installation and I force updated it. The old system still used krb as the login plugin name and it blew up trying to configure it:

DEBUG(ipsilon/util/errors.py:33 Errors.handler()): ['500 Internal Server Error', 'The server encountered an unexpected condition which prevented it from fulfilling the request.', 'Traceback (most recent call last):\n File "/usr/lib/python2.7/site-packages/cherrypy/_cprequest.py", line 656, in respond\n response.body self.oldhandler(args, kwargs)\n File "/usr/lib/python2.7/site-packages/cherrypy/_cpdispatch.py", line 34, in call\n return self.callable(self.args, self.kwargs)\n File "/usr/lib/python2.7/site-packages/ipsilon/util/page.py", line 106, in call\n return op(*args, kwargs)\n File "/usr/lib/python2.7/site-packages/ipsilon/login/common.py", line 281, in root\n plugin plugins.available[first]\nKeyError: u\'krb\'\n', '3.2.2']

This issue ticket was originally removed from the tracker as it clashed with the pull request.
See upstream ticket for migration details.