Fix quota show when there is no project id
Fix quota show when there is no project id

If no id is in the response, quota show fails.

Change-Id: I9905431b006404c9ba8453eba016cec9ebe19402
Closes-Bug: #1481803

dtroyer/python-openstackclient,redhat-openstack/python-openstackclient,redhat-openstack/python-openstackclient,openstack/python-openstackclient,BjoernT/python-openstackclient,BjoernT/python-openstackclient,dtroyer/python-openstackclient,openstack/python-openstackclient