Was a zone file hash issued by a name?  Return {'result': True/False}

def rpc_is_name_zonefile_hash(self, name, zonefile_hash, **con_info):
        """
        Was a zone file hash issued by a name?  Return {'result': True/False}
        """
        if not check_name(name) and not check_subdomain(name):
            return {'error': 'invalid name', 'http_status': 400}

        if not check_string(zonefile_hash, min_length=LENGTHS['value_hash']*2, max_length=LENGTHS['value_hash']*2, pattern=OP_HEX_PATTERN):
            return {'error': 'invalid zone file hash', 'http_status': 400}
        
        was_set = None
        if check_name(name):
            # on-chain name 
            db = get_db_state(self.working_dir)
            was_set = db.is_name_zonefile_hash(name, zonefile_hash)
            db.close()
        else:
            # off-chain name 
            was_set = is_subdomain_zonefile_hash(name, zonefile_hash)

        return self.success_response({'result': was_set})