'Send a feature-not-implemented error if the stanza is not handled.
Overrides StanzaBase.unhandled.'

def unhandled(self):

    if (self['type'] in ('get', 'set')):
        self.reply()
        self['error']['condition'] = 'feature-not-implemented'
        self['error']['text'] = 'No    handlers    registered    for    this    request.'
        self.send()
