'NoneType' error in 'remove_service_catalog'

[shihanzhang]

when I use neutron 'l3-agent-router-add ' to add a l3 agent to router, I find a this error in keystoneclient as bellow:

ERROR: neutronclient.shell 'NoneType' object has no attribute '__getitem__'
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/neutronclient/shell.py", line 731, in run_subcommand
    return run_command(cmd, cmd_parser, sub_argv)
  File "/usr/local/lib/python2.7/dist-packages/neutronclient/shell.py", line 97, in run_command
    return cmd.run(known_args)
  File "/usr/local/lib/python2.7/dist-packages/neutronclient/neutron/v2_0/agentscheduler.py", line 146, in run
    {'router_id': _id})
  File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 99, in with_params
    ret = self.function(instance, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1235, in add_router_to_l3_agent
    body=body)
  File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 295, in post
    headers=headers, params=params)
  File "/usr/local/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 197, in do_request
    content_type=self.content_type())
  File "/usr/local/lib/python2.7/dist-packages/neutronclient/client.py", line 301, in do_request
    return self.request(url, method, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/neutronclient/client.py", line 296, in request
    resp = super(SessionClient, self).request(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/keystoneclient/adapter.py", line 89, in request
    return self.session.request(url, method, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/keystoneclient/utils.py", line 318, in inner
    return func(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/keystoneclient/session.py", line 369, in request
    resp = send(**kwargs)
  File "/usr/local/lib/python2.7/dist-packages/keystoneclient/session.py", line 428, in _send_request
    self._http_log_response(response=resp)
  File "/usr/local/lib/python2.7/dist-packages/keystoneclient/utils.py", line 318, in inner
    return func(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/keystoneclient/session.py", line 204, in _http_log_response
    text = remove_service_catalog(response.text)
  File "/usr/local/lib/python2.7/dist-packages/keystoneclient/session.py", line 63, in remove_service_catalog
    if 'catalog' in data['token']:
TypeError: 'NoneType' object has no attribute '__getitem__'
'NoneType' object has no attribute '__getitem__'