[issue25270] codecs.escape_encode systemerror on empty byte string

[Zachary Ware]

Changes by Zachary Ware <zachary.ware at gmail.com>:


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nosy: +The Compiler, doerwalter, lemburg
stage:  -> needs patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25270>
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