Consider KeyboardInterrupt/SystemExit at collection time

[anitahammer]

[nicoddemus]

Thanks @anitahammer indeed this is a much better UX.

Could you please also:

1. Add a test for this to ensure we do not regress in the future. Probably a simple way to simulate this is to make a module raise KeyboardInterrupt during import and check that the session was interrupted and the message !!! KeyboardInterrupt !!!!!!!!! showed up.
2. Add a CHANGELOG entry
3. Add yourself to AUTHORS (optional)

[anitahammer]

Thank you for the feedback @nicoddemus ! I've added a test case and verified that it was failing before my changes.

[anitahammer]

Hi @nicoddemus

[nicoddemus]

Thanks @anitahammer for the ping!

[nicoddemus]

Thanks a lot @anitahammer!