Merged in kidmose/pywhois/feature/test-missing-keys (pull request #33)
test_parser.py: Fail on missing keys
{"domain_name": ["SHAZOW.NET", "shazow.net"], "expiration_date": "2009-09-13 00:00:00", "updated_date": "2007-08-08 00:00:00", "creation_date": "2003-09-13 00:00:00", "status": "ok"}