Provide correct dummy data for DatabaseLanguageRowsTest
The dummy data provided in DatabaseLanguageRowsTest leads to some E_NOTICEs.
Since PIDs are indispensable when it comes to data in TYPO3 it's not a bug in the core.
The mocking of BE_USER prevents access to "workspace" on null. The result of accessing unset variables/members is always null, therefor the set value is null, too.