sonata-project/SonataDoctrineORMAdminBundle — comment on commit fe1e93f8484d8dc34b3ad1fb19e243bb9a75816d
File: Resources/config/doctrine_orm.xml line 8
By stof:

this definition is useless as the DI extension will always overwrite it.

And btw, it is wrong as you are setting it to an empty string here, not to ``null``