'GETINFO status/fresh-relay-descs' error message unhelpful

Hi network team. Recently we added a stem integ test for 'GETINFO status/fresh-relay-descs' which in practice fails quite a bit with...

Error generating descriptor

This comes from tor. I'm dropping this test from Stem. It might be useful for tor to provide a more explicit error message if we'd care for this to be a reliable and useful GETINFO option.

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