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If coordinate_import is called without any parameters, it produces an exception.

$ python pwb.py scripts/coordinate_import.py
Traceback (most recent call last):
  File "pwb.py", line 157, in <module>
    run_python_file(fn, argv, argvu)
  File "pwb.py", line 67, in run_python_file
    exec(compile(source, filename, "exec"), main_mod.__dict__)
  File "scripts/coordinate_import.py", line 91, in <module>
    main()
  File "scripts/coordinate_import.py", line 88, in main
    coordbot.run()
  File "scripts/coordinate_import.py", line 50, in run
    for page in self.generator:
  File ".../pywikibot/pagegenerators.py", line 973, in PreloadingGenerator
    for page in generator:
TypeError: 'NoneType' object is not iterable
<type 'exceptions.TypeError'>
CRITICAL: Waiting for 1 network thread(s) to finish. Press ctrl-c to abort