special case dir(None), fixes #1835

Closed Bitbucket Importer requested to merge bitbucket/declined-pr-264 into branch/py3.3

Created originally on Bitbucket by numerodix (Martin Matusiak)

Changesets for this Pull Request have not been imported, because it had been already declined on Bitbucket. Marked as closed by the import user.

This should take care of the last test failure in lib-python's test_unittest on py3.3.

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