In core only:
```
$ python pwb.py clean_sandbox -family:wikipedia -lang:en -user
Traceback (most recent call last):
File "pwb.py", line 222, in <module>
run_python_file(filename, argv, argvu, file_package)
File "pwb.py", line 81, in run_python_file
main_mod.__dict__)
File "./scripts/clean_sandbox.py", line 339, in <module>
main()
File "./scripts/clean_sandbox.py", line 335, in main
bot = SandboxBot(**opts)
File "./scripts/clean_sandbox.py", line 184, in __init__
localSandbox = pywikibot.Page(self.site, localSandboxTitle)
File "pywikibot/tools.py", line 711, in wrapper
return obj(*__args, **__kw)
File "pywikibot/tools.py", line 711, in wrapper
return obj(*__args, **__kw)
File "pywikibot/page.py", line 1853, in __init__
raise ValueError(u'Title must be specified and not empty '
ValueError: Title must be specified and not empty if source is a Site.
<type 'exceptions.ValueError'>
```