Stack trace when listing repositories. Reproducer below.

reproducer.py

import github3
from os import environ as env

client = github3.GitHubEnterprise(env['GH_ENDPOINT'], token=env['GH_TOKEN'])
for repository in client.iter_all_repos():
  if repository: 
    print("{}/{}".format(repository.owner, repository.name))

stacktrace.py

Traceback (most recent call last):
  File "scripts/repository_list.py", line 24, in <module>
    main()
  File "scripts/repository_list.py", line 18, in main
    for repository in client.iter_all_repos():
  File "/Users/gm/.pyenv/versions/venv/lib/python2.7/site-packages/github3/structs.py", line 84, in __iter__
    yield cls(i, self) if issubclass(cls, GitHubCore) else cls(i)
  File "/Users/gm/.pyenv/versions/venv/lib/python2.7/site-packages/github3/repos/repo.py", line 121, in __init__
    self.owner = User(repo.get('owner', {}), self._session)
  File "/Users/gm/.pyenv/versions/venv/lib/python2.7/site-packages/github3/users.py", line 123, in __init__
    super(User, self).__init__(user, session)
  File "/Users/gm/.pyenv/versions/venv/lib/python2.7/site-packages/github3/models.py", line 314, in __init__
    if acct.get('type'):
AttributeError: 'NoneType' object has no attribute 'get'