[FIX] mail_thread: allow to pass mail_track_log_only in the context to remove the subtype of the notification. By this way, no mails will be sent because partners_to_notify will be empty.

addons/mail/mail_thread.py

@@ -525,6 +525,8 @@ class mail_thread(osv.AbstractModel):
 
             # find subtypes and post messages or log if no subtype found
             subtypes = []
+            # By passing this key, that allows to let the subtype empty and so don't sent email because partners_to_notify from mail_message._notify will be empty
+            if not context.get('mail_track_log_only'):
                 for field, track_info in self._track.items():
                     if field not in changes:
                         continue