Description of problem:
In the Changeset History view, user can click one of the other user-created environments to view changesets that exist there.  However, trying to click Locker fails to take user back to that view. 

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Create a new environment, "Dev", in ACME_Corporation
2. Content Management > Promotions. 
3. Create a new changeset ("TestChangeset") and promote it to dev
4. Content Management > Changeset History; note that default environment is locker
5. Click "Dev" in the Environment path UI element, observing the correct promotion of your TestChangeset
6. Click Locker in the Environnment path UI element.
  
Actual results:
Locker never changes color
User cannot click through locker

Expected results:
User should be able to nav to Locker just like any other env.

Additional info:
Note: workaround is to simply do Content Management > Changeset History again, but that's still disjointed.  User should be able to traverse the environment paths.