[issue29774] Improve zipfile handling of corrupted extra field

[Serhiy Storchaka]

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


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type: behavior -> enhancement
versions:  -Python 2.7, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29774>
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