[FIX] mail: fix model typo in message_notify

Since #32404, the fallback case where we have no recipients and no parent_id
on message notify has a typo on mail_message. A user will receive a traceback
when using compose message wizard on a record not inheriting from mail_thread if
he forgot to add recipients.

If the typo should be fixed, notifying the user that no recipients were found and thus,
message_notify won't do anything could be interresting. We can raise a UserError
to give a more explicit failure reason.

We would like to avoid to raise this error on a low level like in message_notify
to avoid to break mail_gateway mechanism, but raising it from mail.compose.message
send_mail shouldn't have any side effect.

We can simply check the output of message_notify to know if something was done
to avoid to duplicate logic used to define recipients.

task-2046180

closes odoo/odoo#35378

Signed-off-by: Xavier Dollé (xdo) <xdo@odoo.com>

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