[issue23247] Crash in the reset() method of StreamWriter of CJK codecs

[STINNER Victor]

STINNER Victor added the comment:

> Aaron: Your version of the fix immediately returns None, while Victor’s tries to encode an empty string (if I understand it correctly).

Aaron patch is better. I misunderstood the code. reset() always return None, the empty string is unused in my patch.

fix-multibytecodec-segfault.patch: please write a _new_ test mentionning this issue to check for non regression.

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