[issue27517] LZMACompressor and LZMADecompressor raise exceptions if given empty strings twice

[Serhiy Storchaka]

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


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nosy: +nadeem.vawda, serhiy.storchaka
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/issue27517>
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