Trying to create a feature without session throws ValueError

[MikkoJo]

When trying to create a feature without a session and default user (@me) application should return HTTP:400 Bad Request. Instead it tries to assign AnonymousUser to the feature and throws a ValueError.

Traceback (most recent call last):
File "/home/msjohans/virtualenvs/geonition_test/src/geojson-rest/geojson_rest/tests.py", line 174, in test_unauthorized_post
content_type = 'application/json')
File "/home/msjohans/virtualenvs/geonition_test/local/lib/python2.7/site-packages/django/test/client.py", line 449, in post
response = super(Client, self).post(path, data=data, content_type=content_type, **extra)
File "/home/msjohans/virtualenvs/geonition_test/local/lib/python2.7/site-packages/django/test/client.py", line 262, in post
return self.request(**r)
File "/home/msjohans/virtualenvs/geonition_test/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 111, in get_response
response = callback(request, _callback_args, *_callback_kwargs)
File "/home/msjohans/virtualenvs/geonition_test/local/lib/python2.7/site-packages/django/views/generic/base.py", line 48, in view
return self.dispatch(request, _args, *_kwargs)
File "/home/msjohans/virtualenvs/geonition_test/local/lib/python2.7/site-packages/django/views/generic/base.py", line 69, in dispatch
return handler(request, _args, *_kwargs)
File "/home/msjohans/virtualenvs/geonition_test/src/geojson-rest/geojson_rest/views.py", line 97, in post
group = group)
File "/home/msjohans/virtualenvs/geonition_test/local/lib/python2.7/site-packages/django/db/models/base.py", line 355, in init
setattr(self, field.name, rel_obj)
File "/home/msjohans/virtualenvs/geonition_test/local/lib/python2.7/site-packages/django/db/models/fields/related.py", line 366, in set
self.field.name, self.field.rel.to._meta.object_name))
ValueError: Cannot assign "<django.utils.functional.SimpleLazyObject object at 0xa1dfa6c>": "Feature.user" must be a "User" instance.