[PROD] Image upload difficulty on Admin pages

[szabozoltan69]

Issue

On the Admin page, at countries or regions there are snippets.
Near the snippets there is an option for image upload, but if we try to use it, gives an Error 500.
(There are similar snippets and image upload option for events (emergencies) also, but it works fine.)
In Sentry you can also find this item, id=1648.
Somehow the revisions, the translations, the encoding can be related.

[szabozoltan69]

@batpad @thenav56

[szabozoltan69]

Somehow the country snippet object has no name in /usr/local/lib/python3.8/site-packages/reversion/revisions.py:185:

(Pdb) p content_type
<ContentType: api | country snippet>
(Pdb) pp vars(obj)
{'_mt_disable': False,
 '_state': <django.db.models.base.ModelState object at 0x7f673a02c670>,
 'country_id': 16,
 'id': 102,
 'image': 'countries/2024/03/21/BEE_logo_PERNpnp.jpg',
 'position': 3,
 'snippet': None,
 'snippet_ar': None,
 'snippet_en': None,
 'snippet_es': None,
 'snippet_fr': None,
 'translation_module_original_language': 'en',
 'translation_module_skip_auto_translation': False,
 'visibility': 3}
(Pdb) p obj
(nothing)

[szabozoltan69]

Solution found.
In case of "no HTML snippet part" (only image) no name can be added by Django.
So instead of

    def __str__(self):
        return self.snippet

We should use:

    def __str__(self):
        return self.snippet or self.image.url

Or something similar as at event snippet:

    def __str__(self):
        return self.snippet if self.snippet else ''