def ui_setgroup_auth(self, auth_attr, value):
    self.assert_root()
    if (value is None):
        value = ''
    setattr(self.rtsnode, ('chap_' + auth_attr), value)
def ui_setgroup_auth(self, auth_attr, value):
    self.assert_root()
    if (value is None):
        value = 
    setattr(self.rtsnode, ('chap_' + auth_attr), value)