add default value for os.environ.get #20
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I build the fate environment using
python setup.py install, so I don't havePYTHONPATH.When execute
fate_test benchmark-quality -i benchmark_quality/hetero_nn/, the test cannot start.So I add the default value when the program try to get the environment variable
PYTHONPATHos.environ.get('PYTHONPATH', default="")