[REF] mail: shortcut chat notification if no one to notify

Well, it seems we gain a lot of query when avoiding to format a message we
actually don't have to send on any bus. Cheers.

Formatting message for bus notification is quite costly as it has to fetch
data from message, partner, attachments, subtypes, ... meaning a lot of
queries. With this commit we avoid calling that method when not necessary.

It allows a gain of queries in simple cases when no-one has to be notified
as shown in the performance counters. On overall community runbot about 9K
queries are saved which is not bad for a 2-lines commit.

0 files changed, 0 insertions, 0 deletions