MessageAttachment __str__ change

[Pietro395]

Small change to MessageAttachment str method.

Previously, this exception occurred when "Saving and continue edit" a Message by deleting an attachment

  File "/home/intacloud/env/lib/python3.8/site-packages/django/contrib/admin/utils.py", line 571, in construct_change_message
    "object": str(deleted_object),
  File "/home/intacloud/env/lib/python3.8/site-packages/django_mailbox/models.py", line 867, in __str__
    return self.document.url
  File "/home/intacloud/env/lib/python3.8/site-packages/django/db/models/fields/files.py", line 66, in url
    self._require_file()
  File "/home/intacloud/env/lib/python3.8/site-packages/django/db/models/fields/files.py", line 41, in _require_file
    raise ValueError(
ValueError: The 'document' attribute has no file associated with it

[pfouque]

Hi @Pietro395,
it's not clear how / why we can have an attachment without the message it relates to,
but the str should display more about itself than its parent IMO.
I added a suggestion

[Pietro395]

Hi @Pietro395,
it's not clear how / why we can have an attachment without the message it relates to,
but the str should display more about itself than its parent IMO.
I added a suggestion

Hi @pfouque , you are right.
Tomorrow I'll do a quick test of the change

[Pietro395]

LGTM @pfouque

[pfouque]

Awesome!