Steps to reproduce:

1. go to a Location with depth > 1 (for instance Blog)
2. refresh the page
3. try to open the tree

The console displays:

Uncaught TypeError: Cannot read property 'get' of undefined(anonymous function) @ ez-discoverybarcontenttreeplugin.js:69

This is a regression caused by https://github.com/ezsystems/PlatformUIBundle/commit/cca477fa6f907b197c89dfe42c4361b7edff1105 (EZP-24706) because the path is reused in the tree.