Unable to handle folders in Many-2-Many objet relation fields

[christophluehr]

Case: Many-2-Many field, contains Objects AND folders.
Folders are not of type Concrete -> Error.

removing explicit type in
src/DependencyInjection/PimcoreAdapter.php -> line 9
src/DependencyInjection/BasilicomPathFormatter.php -> line 101

"fixes" it .. but we should find a nicer solution :)