[issue12366] packaging.pypi.dist should abstract download errors.

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I agree that we can wrap exceptions to provide more useful info where needed.  It’s not necessary, however, to always catch exceptions and raise Packaging*Errors instead: distutils and packaging are documented to raise ValueError and other standard exceptions in some cases.

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