Root namespace in expand_fqcn/find_use

[RLievaart]

If I have a class definition without a namespace (in the top directory of my autoload dir), the namespace shoud be \ in expand_fqcn and find_use, instead I get \class_name as namespace:

I.e. when the cursor is on system in system::doSystemStuff() I get \system\system::doSystemStuff() instead of the expected \system::doSystemStuff(). Or use system\system instead of use system.