Wikimedia Bugzilla is closed!

Traceback (most recent call last):
File "pwb.py", line 123, in <module>
run_python_file(fn, argv, argvu)
File "pwb.py", line 64, in run_python_file
exec compile(source, filename, "exec") in main_mod.__dict__
File "unusedfiles.py", line 130, in <module>
main()
File "unusedfiles.py", line 111, in main
for page in generator:
File "/home/acipu/stage/core/pywikibot/pagegenerators.py", line 849, in PreloadingGenerator
for page in generator:
File "/home/acipu/stage/core/pywikibot/pagegenerators.py", line 922, in UnusedFilesGenerator
extension=extension):
File "/home/acipu/stage/core/pywikibot/__init__.py", line 251, in wrapper
return method(*__args, **__kw)
File "/home/acipu/stage/core/pywikibot/__init__.py", line 251, in wrapper
return method(*__args, **__kw)
TypeError: unusedfiles() got an unexpected keyword argument 'extension'

The reason for that is  site.unusedfiles no longer has this parameter. Adding a patch that solves the problem. I kept the extension param in the generator for compatibility reasons.