When formatting a message, a message could be with an empty or obsolete
record_name field. It's better to rely on the relation between the message and
the thread and fetch the current thread name.
task-2411715
closesodoo/odoo#63000closesodoo/odoo#67549
X-original-commit: 51e962803d2048efeb0f7e96a9fe561ac49ee05a
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>