I get the following test failure when running core tests on the Wikidata branch, with items in the main namespace:

/var/www/wikidata-repo/extensions/Wikibase/repo/includes/content/ItemHandler.php(70): Wikibase\EntityHandler->unserializedData('This is not a m...', NULL)

#1 /var/www/wikidata-repo/includes/content/ContentHandler.php(124): Wikibase\ItemHandler->unserializeContent('This is not a m...', NULL)
#2 /var/www/wikidata-repo/tests/phpunit/includes/search/SearchEngineTest.php(97): ContentHandler::makeContent('This is not a m...', Object(Title))
#3 /var/www/wikidata-repo/tests/phpunit/includes/search/SearchEngineTest.php(44): SearchEngineTest->insertPage('Not_Main_Page', 'This is not a m...', 0)

Version: master
Severity: normal