Connect in your browser to a db on runbot with mail installed and wait
until the runbot put to sleep the db. After a while, a new request to
get im_status will be sent and nginx responds to it with an error 404
and an invalid JSON response. A traceback with a particularly bad
message is then shown. Here we improve the traceback message.
closesodoo/odoo#99430
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>