emberjs/ember.js — pull request #4171 by andycrum (2014-01-17 07:04:17+00:00)
Title: [BUGFIX] Check if value is still undefined when triggering Ember.Select's valueDidChange

This PR resolves [this issue](https://github.com/emberjs/ember.js/issues/4147), where Ember.Select's valueDidChange is being triggered even if the value is still undefined.