`st2 apikey create -k` fails when authentication disabled

[LindsayHill]

If authentication is disabled, st2 apikey create -k fails with this error:

vagrant@bwcvagrant:~$ st2 apikey create -k
ERROR: 500 Server Error: Internal Server Error
MESSAGE: Internal Server Error for url: http://127.0.0.1:9101/v1/apikeys

st2api.log contains this:

2017-07-18 05:36:03,099 140399285519696 ERROR router [-] Failed to call controller function "post" for operation "st2api.controllers.v1.auth:api_key_controller.post": 'NoneType' object has no attribute 'name'
Traceback (most recent call last):
  File "/opt/stackstorm/st2/local/lib/python2.7/site-packages/st2common/router.py", line 414, in __call__
    resp = func(**kw)
  File "/opt/stackstorm/st2/local/lib/python2.7/site-packages/st2api/controllers/v1/auth.py", line 140, in post
    api_key_api.user = requester_user.name or cfg.CONF.system_user.user
AttributeError: 'NoneType' object has no attribute 'name'
2017-07-18 05:36:03,103 140399285519696 ERROR error_handling [-] API call failed: 'NoneType' object has no attribute 'name'
Traceback (most recent call last):
  File "/opt/stackstorm/st2/local/lib/python2.7/site-packages/st2common/middleware/error_handling.py", line 46, in __call__
    return self.app(environ, start_response)
  File "/opt/stackstorm/st2/local/lib/python2.7/site-packages/st2common/router.py", line 445, in as_wsgi
    resp = self(req)
  File "/opt/stackstorm/st2/local/lib/python2.7/site-packages/st2common/router.py", line 418, in __call__
    raise e
AttributeError: 'NoneType' object has no attribute 'name' (_exception_data={},_exception_class='AttributeError',_exception_message="'NoneType' object has no attribute 'name'")
2017-07-18 05:36:03,105 140399285519696 INFO logging [-] 07293032-81fe-41ea-8d4d-cdd4e0e222c6 - 500 46 7.573ms (content_length=46,request_id='07293032-81fe-41ea-8d4d-cdd4e0e222c6',runtime=7.573,remote_addr='127.0.0.1',status=500,method='POST',path='/v1/apikeys')

Calling st2 apikey create -k -u st2admin works.

Looking at the code, this is the problem: https://github.com/StackStorm/st2/blob/master/st2api/st2api/controllers/v1/auth.py#L140

            if not getattr(api_key_api, 'user', None):
                api_key_api.user = requester_user.name or cfg.CONF.system_user.user

I think that code should be checking to see if requester_user.name exists, not just checking to see if it is None.

Expected behavior: If authentication is disabled, and the user has not specified a username for the API key, it should default to using the system_user (by default stanley).

Environment:

• Ubuntu 14.04
• ST2 2.3.1

System installed from Vagrant/one-line install. Change made to /etc/st2/st2.conf to set enable = False in [auth] section.