def defaults(self):
        return None

    # -------------------------------------------------------------------------
This just checks that IPYSERVER is set. 
dataset/ETHPy150Open sahana/eden/modules/s3/s3model.py/S3Model.defaults--crossover with--dataset/ETHPy150Open mattfoster/ipython-tmbundle/Tests/test_ipythonClient.py/TestCheckServer.test_check_unset_server