Since version 4.12, articles don't get a category if `CATEGORY_SAVE_AS` is empty/none

• I have read the Filing Issues and subsequent “How to Get Help” sections of the documentation.

• I can reproduce this problem with stock/default settings file, theme, and sample content (as described in above “How to Get Help” sections of the documentation).

• I have searched the issues (including closed ones) and believe that this is not a duplicate.

• OS version and name: Fedora 43

• Python version: 3.14

• Pelican version: 4.12

• Link to theme: N/A

• Links to plugins: N/A

• Link to your site: https://status.fedoraproject.org

• Link to your source: https://github.com/fedora-infra/statusfpo

Issue

Since version 4.12 (and PR #3589), setting CATEGORY_SAVE_AS to a falsish value such as None or an empty string will also prevent the article from being attributed categories in the metadata, for example from its path.

I have a PR to fix it, I'll submit it right now.