Before this commit, when the user clicked on a preview in the systray
messaging menu that is not linked to any document, there was a
traceback.
Steps to reproduce:
- Admin sets notification management to "Handle with Odoo"
- Demo user assigns Admin to a task
- Admin clicks on preview from being assigned to a task
Those are previews from notifications received from the inbox,
which are not related to any document. It attempts to open a
document that does not exists (i.e. no model/id).
With this commit, when such a preview is not linked to any
document, it now opens Discuss with Inbox.
Task-ID 1891350
Alexandre Kühn
b3e450abca