````
class BaseStorageFinder(BaseFinder):

    ...

    def list(self, ignore_patterns):
        
       ....
````

this class is present (and identical with regards to the list method) in both : 

````
staticfiles/finders.py @215
django/contrib/staticfiles/finders.py @206
````

Some kind of argument needs to be provided. this change prevents a yellow error screen.