(fix+feat): If a language doesn't have a value for taxonomy set the default language value

[dobri1408]

We've identified a bug in the language translation of taxonomies. When a value is missing for a specific language, the system incorrectly assigns PATH_SEPARATOR + "" = id. This causes the taxonomy to default to a single value, matching the last term of the default language. Instead, if no value is provided for a given language, the correct behavior should be to use the default language value.

[avoinea]

@ale-rt Now I can see the tests started to fail when I merged master in this branch, thus the issue seems to be also in master branch 🤔

[ale-rt]

@ale-rt Now I can see the tests started to fail when I merged master in this branch, thus the issue seems to be also in master branch 🤔

I see this:

Traceback (most recent call last):
  File "/home/runner/work/collective.taxonomy/collective.taxonomy/src/collective/taxonomy/tests/test_controlpanel_restapi.py", line 7, in <module>
    from plone.restapi.testing import RelativeSession
  File "/home/runner/work/collective.taxonomy/collective.taxonomy/.tox/py313-plone62/lib/python3.13/site-packages/plone/restapi/testing.py", line 33, in <module>
    import collective.MockMailHost
ModuleNotFoundError: No module named 'collective.MockMailHost'

Which can be solved by adding plone.restapi[test] in the setup extra_require.

[avoinea]

@ale-rt plone.restapi[test] was there. Somehow removing the namespace_packages, which seems deprecated did the trick. Also the init.py from src/collective 🤔

Seems green now.

[ale-rt]

@ale-rt plone.restapi[test] was there. Somehow removing the namespace_packages, which seems deprecated did the trick. Also the init.py from src/collective 🤔

Seems green now.

Uh!
Basically you ran into #188 and you need this first #189

CC @gforcada

[gforcada]

Yes, there is a porting guide to move python distributions to native namespace: https://6.docs.plone.org/developer-guide/native-namespace.html

Although the use case there is mostly for core packages, which have been ported already, there is enough remarks on which steps to skip to be useful for internal or collective python distributions.

Please give it a go and report back 😄

If the repository already uses plone.meta everything should be smoother as well 🧼