Fix risky test

3) Wikibase\Test\PropertyViewTest::testParserOutputLinks with data set "empty" (array(), array())
This test did not perform any assertions

/var/www/phase3/tests/phpunit/MediaWikiTestCase.php:133
/usr/bin/phpunit.phar:583
/usr/share/pear/PHPUnit/Runner/Version.php:3

Change-Id: Id90692b9cea5b50d5aa8c85ab5ab5b41e49d66fa
Merge "Fix risky test"