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I have had a look at the issue more closely and my initial patch was not completely right as it didn't work properly with argparse_test.py despite all tests passing.
Therefore, I have amended my patch to not check whether action.default was a basestring which didn't make sense at all, but check instead if action.default is None (action.default default value is None if not given to add_argument as far as I understand). I also added a test for the issue reported above as it was missing and ran patchcheck to make sure everything was fine. All the tests (include argparse_test.py) passes without problem.
Could you please apply them? Many thanks.