Previously, when registering a hotkey without an area then a hotkey with
area, there would be a crash, as that latest hotkey is the candidate
winner, and we then check that there is no other matching hotkey with an
area that's more specific. In doing this, we assume all other candidates
have an area and call it as a function, but since some hotkey
registrations don't have one, we get a crash.
This commit fixes that by filtering the candidates to only those which
have an area before trying to narrow down to the most specific one.
Part-of: odoo/odoo#98535
Samuel Degueldre
38e7589042