vyos.utils: T9269: no zero-component key path for an empty dict

dict_to_key_paths() yields the path leading to an empty dict, which is a
valueless leaf node. An empty dict at the top level means "no
configuration" and yielded a single zero-component path, making
dict_to_paths_values() report an option named ''.

A bare "interfaces ethernet eth1" - as found in a container, where no
hw-id is deployed - could therefore not be added to a bond:

  Cannot add interface "eth1" to bond, it has a "" assigned!

interfaces_ethernet.py recorded the same phantom path in
bond_blocked_changes. configdiff.py was immune, owner([]) is falsy.

0 files changed, 0 insertions, 0 deletions