File "/home/seirl/swh-environment/.venv/lib/python3.5/site-packages/django/views/decorators/cache.py", line 57, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/home/seirl/swh-environment/swh-web/swh/web/api/apidoc.py", line 108, in documented_view
    doc_data = self.get_doc_data(f)
  File "/home/seirl/swh-environment/swh-web/swh/web/api/apidoc.py", line 187, in get_doc_data
    data['examples'] = self.build_examples(data['urls'], data['args'])
  File "/home/seirl/swh-environment/swh-web/swh/web/api/apidoc.py", line 149, in build_examples
    url = reverse(data_url['name'], kwargs=defaults)
  File "/home/seirl/swh-environment/swh-web/swh/web/common/utils.py", line 37, in reverse
    kwargs=kwargs, current_app=current_app)
  File "/home/seirl/swh-environment/.venv/lib/python3.5/site-packages/django/urls/base.py", line 91, in reverse
    return force_text(iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)))
  File "/home/seirl/swh-environment/.venv/lib/python3.5/site-packages/django/urls/resolvers.py", line 497, in _reverse_with_prefix
    raise NoReverseMatch(msg)
django.urls.exceptions.NoReverseMatch: Reverse for 'None' not found. 'None' is not a valid view function or pattern name.