Entry created from Miniflux via API with full content has empty published_by

Environment

• Version: 2.6.14
• Installation: Docker image
• PHP version: Unknown
• OS: NixOS
• Database: PostgreSQL 17.10 (Debian 17.10-1.pgdg12+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14+deb12u1) 12.2.0, 64-bit
• Configuration: Likely irrelevant

What steps will reproduce the bug?

• Configure the wallabag integration in Miniflux (leave "Send only URL instead of full content" unchecked)
• Subscribe to https://dev.jimgrey.net/feed/ in Miniflux
• Save an article to wallabag via the Miniflux integration (e.g. with https://dev.jimgrey.net/2026/07/01/engineering-the-operating-model/)

Result in postgres:

Article saved manually via wallabag (OK)

wallabag=> select id, title, published_by from wallabag_entry where id=1666;
  id  |              title              | published_by 
------+---------------------------------+--------------
 1666 | Engineering the operating model | N;
(1 row)

Article saved via Miniflux with "Send only URL" checked (OK)

wallabag=> select id, title, published_by from wallabag_entry where id=1667;
  id  |              title              | published_by 
------+---------------------------------+--------------
 1667 | Engineering the operating model | N;
(1 row)

Article saved via Miniflux with "Send only URL" unchecked (NOK)

wallabag=> select id, title, published_by from wallabag_entry where id=1668;
  id  |              title              |   published_by    
------+---------------------------------+-------------------
 1668 | Engineering the operating model | a:1:{i:0;s:0:"";}
(1 row)

I'd expect to never have empty publisher names. These should be filtered out and if the remaining array is empty then store NULL.

Here's the relevant excerpt from Miniflux, where the payload is constructed:

https://github.com/miniflux/v2/blob/79d920bc1ac900834322fcfe13b6e228228c2fe0/internal/integration/wallabag/wallabag.go#L65-L74