fix:formatting of error message about missing group #211
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Fix #210
I'm having some difficulties with linters (loads of errors from
both flake8 andmypy) and running the tests (one failure) before I made my changes. Probably I haven't set my environment up correctly: certainly tox didn't like it at all and failed to install anything.My new test passes, the files I've touched lint OK, so I don't think I've made things any worse. But also the github workflow hasn't run in my repo, so I can't be sure. Therefore you might want to take this into a branch of your repo first and run tests yourself!