Merged in kidmose/pywhois/feature/test-missing-keys (pull request #33)
test_parser.py: Fail on missing keys
{"domain_name": "URLOWL.COM", "expiration_date": "2018-02-21 19:24:57", "updated_date": "2017-03-31 07:36:34", "status": "clientTransferProhibited https://icann.org/epp#clientTransferProhibited", "creation_date": "2013-02-21 19:24:57"}