Last modified: 2014-02-19 23:31:32 UTC
Try parsing this: [[File:Foo.jpg|thumb|Caption [[Link1]] [[]] [[Link2]] ]] versus [[File:Foo.jpg|thumb|Caption [[Link1]] [[a]] [[Link2]] ]]
http://localhost:8000/_rt/plwiki/Front_wschodni_(II_wojna_%C5%9Bwiatowa) is the test page
The PHP parser parses empty wiki link as text. Test page: https://www.mediawiki.org/wiki/User:GWicke/Test/EmptyLink
Change 112401 had a related patch set uploaded by Hardikj: Bug 60753 - Images: Empty link not accepted in image caption https://gerrit.wikimedia.org/r/112401
Change 112401 merged by jenkins-bot: (Bug 60753) Accept empty links in image caption. https://gerrit.wikimedia.org/r/112401