Fixed #8351 -- Fixed the returned value when we attempt to load a cache-backed...

        if session_data is not None:

            return session_data

        self.create()

        return {}

    def create(self):

        while True:

>>> db_session = DatabaseSession()

>>> db_session.modified

False

>>> db_session.get('cat')

>>> db_session['cat'] = "dog"

>>> db_session.modified

True

>>> Session.objects.filter(pk=db_session.session_key).delete()

>>> db_session = DatabaseSession(db_session.session_key)

>>> db_session.save()

>>> DatabaseSession('1').get('cat')

>>> file_session = FileSession()

>>> file_session.modified

>>> file_session.delete(file_session.session_key)

>>> file_session.exists(file_session.session_key)

False

>>> FileSession('1').get('cat')

>>> file_session['foo'] = 'bar'

>>> file_session.save()

>>> Session.objects.filter(pk=cache_session.session_key).delete()

>>> cache_session = CacheSession(cache_session.session_key)

>>> cache_session.save()

>>> CacheSession('1').get('cat')

>>> s = SessionBase()

>>> s._session['some key'] = 'exists' # Pre-populate the session with some data