[issue33399] site.abs_paths should handle None __cached__ type

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

I didn't bother digging as I assume this was done for a reason. I left a request for changes on the PR to make the code has a stricter `try` block.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33399>
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