"mbs-build submit" crashes with AssertionError

[contyk]

I was trying out the new mbs-build script that utilized python-openidc-client to submit a build of Base Runtime module. The first time I called it, the script told me that my token has expired and exited. The second time I called it it opened a browser and crashed with the following output:

% mbs-build submit -w
INFO: You have not provided SCM URL or branch. Trying to get it from current working directo
INFO: Submitting module build git://pkgs.fedoraproject.org/modules/base-runtime?#464026abf9cc4d01975
INFO: Trying to get the token from https://id.fedoraproject.org/openidc/
Please visit https://id.fedoraproject.org/openidc/Authorization?scope=openid+https%3A%2F%2FiFscope%2Fgroups+https%3A%2F%2Fmbs.fedoraproject.org%2Foidc%2Fsubmit-build&redirect_uri=http%3747%2F&response_mode=query&response_type=code&client_id=mbs-authorizer to grant authorizati
Traceback (most recent call last):
  File "/usr/lib64/python2.7/wsgiref/handlers.py", line 85, in run
    self.result = application(self.environ, self.start_response)
  File "/usr/lib/python2.7/site-packages/openidc_client/__init__.py", line 424, in _token_app
    kv = dict([v.split('=', 1) for v in split])
ValueError: dictionary update sequence element #0 has length 1; 2 is required
127.0.0.1 - - [07/Apr/2017 19:13:35] "GET /favicon.ico HTTP/1.1" 500 59
Traceback (most recent call last):
  File "/home/contyk/bin/mbs-build", line 321, in <module>
    main()
  File "/home/contyk/bin/mbs-build", line 302, in main
    args.idprovider, args.pyrpkg_client)
  File "/home/contyk/bin/mbs-build", line 207, in submit_module_build
    body)
  File "/home/contyk/bin/mbs-build", line 142, in send_authorized_request
    scopes=scopes, **kwargs)
  File "/home/contyk/bin/mbs-build", line 88, in _send_oidc_request
    token = oidc.get_token(scopes, new_token=new_token)
  File "/usr/lib/python2.7/site-packages/openidc_client/__init__.py", line 144, in get_token
    uuid = self._get_new_token(scopes)
  File "/usr/lib/python2.7/site-packages/openidc_client/__init__.py", line 457, in _get_new_token
    assert self._retrieved_code is not None
AssertionError

The browser displayed a generic error message. I'm not sure where the error really is or whether I was just doing something wrong; the user experience wasn't the best :)

Note when I kept the browser open and ran the same thing for the third time, it worked fine.