Merged in kidmose/pywhois/feature/test-missing-keys (pull request #33)
test_parser.py: Fail on missing keys
{"domain_name": "IMDB.COM", "expiration_date": "2016-01-04 00:00:00", "updated_date": "2008-03-28 00:00:00", "status": "clientTransferProhibited", "creation_date": "1996-01-05 00:00:00"}