[issue27570] Avoid memcpy(. . ., NULL, 0) etc calls

[Martin Panter]

Martin Panter added the comment:

Looks like revisions 5f3f6f1fb73a and ec537f9f468f may have fixed the listobject cases.

Also 66feda02f2a5 looks relevant. Benjamin, maybe you are interested in other bits of my patches :)

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nosy: +benjamin.peterson

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