[docs] [issue19095] Document SSLSocket.getpeercert always returns None without do_handshake

[Antoine Pitrou]

Antoine Pitrou added the comment:

To be honest I'd rather have it raise an exception in that case. None isn't helpful as it could mean other things.

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nosy: +christian.heimes, giampaolo.rodola, janssen, pitrou

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<http://bugs.python.org/issue19095>
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