Merged in kidmose/pywhois/feature/test-missing-keys (pull request #33)
test_parser.py: Fail on missing keys
{"domain_name": "DIGG.COM", "expiration_date": "2010-02-20 00:00:00", "updated_date": "2007-03-13 00:00:00", "status": ["clientDeleteProhibited", "clientRenewProhibited", "clientTransferProhibited", "clientUpdateProhibited"], "creation_date": "2000-02-20 00:00:00"}