'Legacy behaviour'

def _get_application_settings(self, application_id, settings_key, error_message):

    if (not application_id):
        value = SETTINGS.get(settings_key, empty)
        if (value is empty):
            raise ImproperlyConfigured(error_message)
        return value
    else:
        msg = 'LegacySettings    does    not    support    application_id.    To    enable    multiple    application    support,    use    push_notifications.conf.AppSettings.'
        raise ImproperlyConfigured(msg)
