#15 Check for ActionMessages in HttpSession

Struts 1.2 allows ActionMessages to be stored in the
HttpSession instead of the Request.
StrutsTestCase.verifyActionMessages(String[]) does not
check for ActionMessages in the Session and therefore
fails when it should not.
I patched
servletunit.struts.Common.verifyActionMessages(..) so
that it tries to retrieve ActionMessages from the
Session if it did not find it in the Request.

[Anonymous]

Unified diff against Rev. 1.41