Selecting falsey values does not display label

[michalgm]

If you have an option value that evaluates to something falsey (i.e. 0, false, or null), then selecting that value will change the model, but the displayed value is blank. Here is a plunk with an example http://plnkr.co/edit/lcw2qeTlIwa9oJmM9Irx

Here is the same plunk with a fix applied: http://plnkr.co/edit/73gDJqXmUdU83G8dOxaM