e.g. on https://www.mediawiki.org/wiki/RelPath it goes to a 404.
Topic on Template talk:PHPLibraryLinks
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Thank you Aklapper!
This is fixed now in the 2 most recent revisions of this template: Special:Diff/4142521, Special:Diff/4142480. Some PHP libraries don't have projects on Phabricator, so a {{{phab-tag-exists}}}
parameter was added to mitigate that. Currently adding documentation for this parameter.
This was also fixed on RelPath, at Special:Diff/4142500.
(I admittedly should've fixed this earlier, heh)