Update role 'NoneType' object has no attribute 'setdefault'

Fix proposed to branch: master
Review: https://review.openstack.org/55141

Reviewed: https://review.openstack.org/55141
Committed: http://github.com/openstack/keystone/commit/24da79bded4385e62265f43977efdcd2237f83d3
Submitter: Jenkins
Branch: master

commit 24da79bded4385e62265f43977efdcd2237f83d3
Author: Marcos Lobo <email address hidden>
Date: Mon Nov 4 14:10:59 2013 +0100

    Role NoneType object has no attribute setdefault

    Havana Keystone configured with LDAP.

    When you try to update a role using the API:

    curl -X PATCH --insecure -H "X-Auth-Token:the_token" -H
    "Content-type:
    application/json" -d '{"role": {"name": "the new name"}}'
    https://localhost:35357/v3/roles/role_id

    Keystone server raises an error:

    {"error": {"message": "An unexpected error prevented the server from
    fulfilling your request. 'NoneType' object has no attribute
    'setdefault'", "code": 500, "title": "Internal Server Error"}}

    The role information is updated, but keystone server raises that
    error.

    Closes-Bug: #1247830

    Change-Id: I686e40e42371f6e2cea55110554456a33939799c