nox -e _recipe_name can crash with JSONDecodeError if conda prints warnings

[venkatkapil24]

It runs conda _____ --json --dry-run and expects clean JSON, but if Conda prints any warning, nox mixes warning text with JSON and json.loads() fails. The error message is generic and doesn't point to an underlying conda "issue".

The fix is easy. Add to the following line

https://github.com/venkatkapil24/atomistic-cookbook/blob/7dc41a2a0cbde10b00609d0b14cc5b29b1974739/noxfile.py#L363

stderr=subprocess.PIPE,
this ensures the output is a json.

[venkatkapil24]

@ceriottm do you want me to fix this in #217 ?

[pfebrer]

I'm not Michele but I would say please don't mix it with the other PR 😅

Can I ask which warning do you get? Maybe it is better to deal with the warning. But your PR seems to build fine no?

[ceriottm]

I also got these kinds of errors when running locally. Updating conda tends to fix them, but indeed maybe it's indeed more user friendly not to fail without giving a meaningful error message. Should definitely be a separate PR though, and I'd like to intercept the warning/error, make sure it is just a warning and print it out in such a way it does not mess with parsing the json, but that the user sees the warning issued by conda.