'Summary widget method
@param r: the S3Request
@param method: the widget method
@param widget_id: the widget ID
@param visible: whether the widget is initially visible
@param attr: controller attributes'

def widget(self, r, method=None, widget_id=None, visible=True, **attr):

    output = {}
    if (r.http == 'GET'):
        r.error(501, current.ERROR.NOT_IMPLEMENTED)
    else:
        r.error(405, current.ERROR.BAD_METHOD)
    return output
