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

[Dariusz Suchojad]

Dariusz Suchojad added the comment:

> I'm not sure people depend on getpeercert() returning None before the
> handshake is done, or perhaps by accident?

Ah, no, I meant that people may depend on the documented behaviour of .getpeercert's returning an empty dict (which I mixed up with returning None) if the certificate was not validated.

That this dictionary's contents depends on the validation is a bit quirky but it's documented so changing that one would surely break existing code.

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