IDEA: missing-tests-pypi-error? condition

[jgart]

Hi Guixers,

I was recently reviewing a patch by a contributor and was discussing the notion 
of preferring upstream to PyPI when tests are missing on PyPI.

WDYT if we also signalled a special condition when there are missing tests in 
PyPI?

I'm thinking of something similar to here:

https://git.savannah.gnu.org/cgit/guix.git/tree/guix/import/pypi.scm?h=master#n562

Maybe it can be a missing-tests-pypi-error?

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jgart