initialize receiver zones

def initialize_zones(self):
        """initialize receiver zones"""
        zone_list = self.location_info.get('zone_list', {'main': True})

        for zone_id in zone_list:
            if zone_list[zone_id]:  # Location setup is valid
                self.zones[zone_id] = Zone(self, zone_id=zone_id)
            else:                   # Location setup is not valid
                _LOGGER.debug("Ignoring zone: %s", zone_id)