Unexpected errors in the browser console after restarting a workspace

[musienko-maxim]

[Short description of problem here]

Reproduction Steps:

1. Launch a workspace. Go to the IDE.
2. Workspace ->Stop. Open browser Console. Launch the workspace again from widget.

Expected behavior: the Terminal should be launched. There is no a javascript errors
Observed behavior: the Terminal does not run. We have errors in the javascript console like:

_app-0.js:846 Fri Jul 22 13:12:57 GMT+300 2016 com.google.gwt.logging.client.LogConfiguration SEVERE: (TypeError) : Cannot read property 'Bm' of nullcom.google.gwt.core.client.JavaScriptException: (TypeError) : Cannot read property 'Bm' of null at Unknown.yk(_app-0.js) at Unknown.xk(_app-0.js) at Unknown.eval(_app-0.js) at Unknown.eval(_app-0.js)

Expected behavior: after clicking on the fires item the Compare button should be enabked
Observed behavior: after clicking on the fires item the Compare button still disabled
Che version: 4.6.0
OS and version: Ubuntu OS 14.0
Docker version: 1.11.2
Che install: local bundle
Additional information:

• Problem started happening recently, didn't happen in an older version of Che: YES