how to disable requests to gravatar.com?

edit

This was solved: as admin go to "settings" ... -> "user settings" -> uncheck "use automatic avatars from gravatar.com".

Well the matter I want to point is in the user_get_avatar_url function from models/__init__.py

In this function, we have :

            ...
            logging.critical(message)
            raise django_exceptions.ImproperlyConfigured(message)
    else:
        return self.get_gravatar_url(size)
else:
    ...

But shouldn't it be

        ...
            logging.critical(message)
            raise django_exceptions.ImproperlyConfigured(message)
    else:
        if askbot_settings.ENABLE_GRAVATAR:
            return self.get_gravatar_url(size)
        else:
            return self.get_default_avatar_url(size)
else:
    ...

in order to entirely disable requests to gravatar website?