users in permissions is represented as empty strings

[markkuleinio]

The problem:

>>> permission = list(netbox.users.permissions.all())[0]
>>> from pprint import pprint as ppr
>>> ppr(dict(permission))
{'actions': ['view'],
 'constraints': None,
 'description': '',
 'display': 'ViewSites',
 'enabled': True,
 'groups': [],
 'id': 1,
 'name': 'ViewSites',
 'object_types': ['dcim.site'],
 'url': 'http://netbox-test.lein.io/api/users/permissions/1/',
 'users': [{'display': 'test1',
            'id': 2,
            'url': 'http://netbox-test.lein.io/api/users/users/2/',
            'username': 'test1'}]}
>>> permission.users
[]
>>>

Meaning that the username "test1" is shown as an empty string. That is because Record.__str__() only tries to get fields name and label, and returns empty string if neither of those is found.