[issue32711] Fix warnings for Python/ast_unparse.c

[Serhiy Storchaka]

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

I think it is better to not add the default case in switch statements. If once we will add a new binary or unary operator, but forgot to update ast_unparse.c the compiler will immediately warn about this if there are no default cases. But if there is a default case the compiler will be silent.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue32711>
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