[issue32503] Avoid creating small frames in pickle protocol 4

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

In the current form the change is trivial, just an additional check. Actually it fixes a regression introduced in issue31993. Currently even empty frames can be produced (when fast=True).

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<https://bugs.python.org/issue32503>
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