Jasig/java-cas-client — pull request #87 by battags (2014-11-20 21:31:03+00:00)
Title: CASC-233 ErrorRedirectFilter Can throw Null Pointer Exception

Problem: the ErrorRedirectFilter assumes there is a root cause and will null pointer if there is not.
Solution: Only use the root cause if there is one, otherwise use the original exception.

QA Notes: Added unit test to confirm non-root cause error.