emberjs/ember.js — pull request #9913 by rwjblue (2014-12-14 15:05:23+00:00)
Title: [BUGFIX beta] Consistently use isStream helper.

There were a number of scenarios where we were not properly gaurding against `null` or `undefined` objects before checking for `isStream` on them. This refactors all `someThing.isStream` checks to use the stream utility function which handles this properly.

Fixes #9910.