[issue20586] Argument Clinic: functions with valid sig but no docstring have no __text_signature__

[Zachary Ware]

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


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versions: +Python 3.5
Added file: http://bugs.python.org/file36143/issue20586.diff

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<http://bugs.python.org/issue20586>
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