fix unit tests

git-svn-id: https://svn.apache.org/repos/asf/archiva/sandbox/trunk@1487819 13f79535-47bb-0310-9956-ffa450edef68
catch PersistenceException to correctly chain the exception

git-svn-id: https://svn.apache.org/repos/asf/archiva/sandbox/trunk@1487820 13f79535-47bb-0310-9956-ffa450edef68