Fix issue 90 - empty manifest config support on Windows

[sunnycarter]

Fix for #90

Tested with repro on Windows and Linux.

I'm not quite sure what to do with the CHANGELOG.md I'm afraid so please give guidance.

[sunnycarter]

Thanks for the review, the nod to write a utility function led me to discover there's an inbuilt one

[vsoch]

Thanks for the review, the nod to write a utility function led me to discover there's an inbuilt one

Nice! And good intuition to look for that too!

For the DCO you can click on "Details" to learn more about that - if I remember it's just an electronic page you need to agree to and then you are good. It would only be done once! The ORAS family of projects is under the CNCF umbrella so we follow these policies that are enforced there.

[vsoch]

I'm not quite sure what to do with the CHANGELOG.md I'm afraid so please give guidance.

For this, you'll want to increment the version to 0.1.18 here:

oras-py/oras/version.py

Line 5 in 209c9b9

__version__ = "0.1.17"

And then make a note (with that corresponding version) on a newline above 0.1.17 here https://github.com/oras-project/oras-py/blob/main/CHANGELOG.md

[sunnycarter]

Thanks for looking at this, I've now signed all commits to fulfil the DCO, and pushed a new commit with a patch version bump and changelog update.