[issue30088] mailbox.Maildir doesn't create subdir structure when create=True and base dir exists

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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components: +email
nosy: +barry, r.david.murray
stage:  -> patch review
versions:  -Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30088>
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