[docs] [issue21596] asyncio.wait fails when futures list is empty

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at gmail.com>:


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nosy: +giampaolo.rodola, gvanrossum, haypo, pitrou, yselivanov

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21596>
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