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If [[file:]] (or other namespaces) exists in the page Cosmetic_changes.py will crash
The error:

Traceback (most recent call last):
  File "pwb.py", line 164, in <module>
    run_python_file(fn, argv, argvu)
  File "pwb.py", line 69, in run_python_file
    exec(compile(source, filename, "exec"), main_mod.__dict__)
  File "scripts/cosmetic_changes.py", line 971, in <module>
    main()
  File "scripts/cosmetic_changes.py", line 965, in main
    bot.run()
  File "/home/reza/pycore/pywikibot/bot.py", line 939, in run
    self.treat(page)
  File "scripts/cosmetic_changes.py", line 904, in treat
    changedText = ccToolkit.change(page.get())
  File "scripts/cosmetic_changes.py", line 228, in change
    new_text = self._change(text)
  File "scripts/cosmetic_changes.py", line 221, in _change
    text = self.safe_execute(method, text)
  File "scripts/cosmetic_changes.py", line 199, in safe_execute
    result = method(text)
  File "scripts/cosmetic_changes.py", line 548, in cleanUpLinks
    'startspace'])
  File "/home/reza/pycore/pywikibot/textlib.py", line 224, in replaceExcept
    replacement = new(match)
  File "scripts/cosmetic_changes.py", line 442, in handleOneLink
    namespace = page.namespace()
  File "/home/reza/pycore/pywikibot/page.py", line 154, in namespace
    return self._link.namespace
  File "/home/reza/pycore/pywikibot/page.py", line 4160, in namespace
    self.parse()
  File "/home/reza/pycore/pywikibot/page.py", line 4137, in parse
    % self._text)
pywikibot.exceptions.Error: Invalid link (no page title): 'file:'
<class 'pywikibot.exceptions.Error'>
CRITICAL: Waiting for 1 network thread(s) to finish. Press ctrl-c to abort