Right sidebar panel for no selection is not triggered anymore

[kulmann]

Steps to reproduce

1. Log in, don't select anything
2. Open right sidebar
3. See <username> as folder

Expected behaviour

We have a right sidebar panel which is supposed to be shown when nothing is selected on root level (Select a file or folder to view details., coming from the NoSelection.vue panel).

Actual behaviour

You see Details and all the subpanels for an ominous <username> folder.

[kulmann]

Bug analysis

Since the owncloud-sdk v2 upgrade the isRootFolder check in SideBar.vue is broken, because it checks for an empty path, but that is / now for the root node.