stefanpenner/ember-cli — pull request #641 by WMeldon (2014-05-07 12:46:22+00:00)
Title: Trim error was thrown when linked ember-cli had detached HEAD.

If the contents of the ./git/HEAD file does not return a ref path,
it's a SHA value so that is what will be used.

This bug only affects people hacking on ember-cli itself.