Last modified: 2012-12-13 11:19:47 UTC
It's now possible to create sitelinks to articles not existing on the specified Wikipedia. This bug was introduced after the new Sites stuff got merged in.
It seems like the 'missing' marker is not handled in MediaWikiSite::normalizePageName and/or MediaWikiSite::extractPageRecord. Should be an easy fix.
https://gerrit.wikimedia.org/r/#/c/22896/
Verified in Wikidata demo time for sprint 15