[FIX] mail: raise a missing email error instead of crash when logging without email

Currently when posting a message if the author has no email address an user
error is raised. Indeed as posting a message goes through the process of
creating notifications and sending emails an email address is required on
the user.

In saas 11.2 a _message_log shortcut has been added to log notes and in saas
11.3 a message_notify has been added to notify peopel of a custom content.
Those methods should have the same behavior when author has no email.
Currently there is a crash when trying to encode its email. After this commit
an exceptions is raised like classic post.

This commit is a manual forward-port of 3a978cc64e6b1d8aca7cfd5d4e319bcb302dd262 as well as an improvement
to fix the newly-introduced message_notify method.

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