Fix for OPENAM-3930, review CR-4545: NPE when trying to submit a POST request to /json/authenticate with sessionUpgrade and authIndexType parameters and authIndexValue missing

git-svn-id: https://svn.forgerock.org/openam/trunk/openam@10614 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d