[acjohnson55]

I have to disagree with you there. It's simply not a good idea to have a works-sometimes syntax for "if property is unset". The brevity doesn't make up for the fact that you sometimes have to fallback on the explicit check anyway. It may look clever but it's an abusage, and you're eventually going to get a production error, unless you're testing for it, and if you've got tests for that, brevity has already lost.