[issue6973] subprocess.Popen.send_signal doesn't check whether the process has terminated

[Tshepang Lekhonkhobe]

Changes by Tshepang Lekhonkhobe <tshepang at gmail.com>:


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versions: +Python 3.5 -Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6973>
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