[issue15767] add ModuleNotFoundError

[Eric Snow]

Changes by Eric Snow <ericsnowcurrently at gmail.com>:


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assignee: brett.cannon -> eric.snow
resolution: rejected -> 
stage:  -> needs patch
status: closed -> open
versions: +Python 3.6 -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15767>
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