- correct `directory_output` value
- mute logger for desired raise exception
- change how the "already imported files" are checked when
"check_duplicated_files = True" :
It occurs that a task o2m field `attachment_ids` returns an empty record
when checked during the `_file_to_import()` method... but only when
the module `autovacuum_message_attachment` is installed !
clementmbr
David Beal
Sébastien BEAU
Florian da Costa
Giovanni