Populates the Django user object using the default bind credentials.

def populate_user(self):
        """
        Populates the Django user object using the default bind credentials.
        """
        user = None

        try:
            # self.attrs will only be non-None if we were able to load this user
            # from the LDAP directory, so this filters out nonexistent users.
            if self.attrs is not None:
                self._get_or_create_user(force_populate=True)

            user = self._user
        except ldap.LDAPError as e:
            results = ldap_error.send(self.backend.__class__,
                                      context='populate_user', exception=e)
            if len(results) == 0:
                logger.warning(u"Caught LDAPError while authenticating %s: %s",
                               self._username, pprint.pformat(e))
        except Exception as e:
            logger.error(u"Caught Exception while authenticating %s: %s",
                         self._username, pprint.pformat(e))
            logger.error(''.join(traceback.format_tb(sys.exc_info()[2])))
            raise

        return user