'Remove slave(s) from and existing zone (multi-room).
Zone must already exist and slaves array can not be empty.
Note: If removing last slave, the zone will be deleted and you\'ll have
to create a new one. You will not be able to add a new slave anymore
:param slaves: slaves to remove from the zone'

def remove_zone_slave(self, slaves):

    if (not slaves):
        _LOGGER.warning('Unable    to    find    slaves    to    remove')
    else:
        _LOGGER.info(('Removing    slaves    from    zone    with    master    ' + str(self.device.config.name)))
        self.device.remove_zone_slave([slave.device for slave in slaves])
