'Return the parameter_id of the resilience indicator'

@staticmethod
def vulnerability_resilience_id():

    if (S3VulnerabilityModel.resilience_pid is None):
        db = current.db
        table = db.vulnerability_aggregated_indicator
        row = db((table.uuid == 'Resilience')).select(table.parameter_id, limitby=(0, 1)).first()
        try:
            S3VulnerabilityModel.resilience_pid = row.parameter_id
        except:
            pass
    return S3VulnerabilityModel.resilience_pid
