Adjust test to cause fatal in DataRebuiler for SMWSparqlStore

Cause failure as reported by [0]

[0] http://wikimedia.7.x6.nabble.com/PHP-Fatal-error-php-rebuildData-php-p-tp5026625.html
Fix Call to undefined method SMWSparqlStore::getDatabase
Merge pull request #291 from SemanticMediaWiki/bug-datarebuilder-sparqlstore

Fix Call to undefined method SMWSparqlStore::getDatabase