Main operation of the executor.

    Returns True when a job was downloaded and executed.
    Returns False when no job could be downloaded.

def download_and_run(config):
    '''
    Main operation of the executor.

    Returns True when a job was downloaded and executed.
    Returns False when no job could be downloaded.
    '''
    job = fetch_job(config)
    if job:
        job._run_validate()
        return True
    else:
        return False