Ensure stale empty python module directories don't break the build about importlib_metadata

[FFY00]

Thanks for reaching out! Do you have any simple reproducible that triggers the issue?

In your use-case, are .dist-info or .egg-info directories left behind? If so, I think we could add some code to validate the metadata directories, but it also points out to another issue — why aren't these directories being cleaned up?

[kanavin]

I would need a bit of time to confirm a reproducible on my side, but I believe it happens when files from the previous module version are removed, but not the directory tree they were in. This is a peculiarity (or shortcoming if you will) of bitbake build system used in yocto which tracks files but not directories.