why does it fail - it shouldn't affect anything

cc @Raydiation @LukasReschke 


It calls after some wrappers the same methods. But with this applied a unit test fails

```
Test_Files_Versioning::testCopy
Failed asserting that false is true.

/home/mjob/Projekte/owncloud/master/apps/files_versions/tests/versions.php:366
```