[FIX] mail: avoid notifying a message by email when it is already an email

When creating a mail.mail without giving a mail_message_id, a new mail.message
is created. It does then through _notify that notifies people of the message
creation. This leads to mail being sent two times, one when sending the
mail.mail, one when sending the notification.

This commits fixes that behavior. When creating directly a mail.mail without
giving a mail.message, call to _notify is bypassed. This way either an email
is created, either a message that has to be notified is created, but not both.

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