Don't abort if cleaning multiple workflows.

[hjoliver]

These changes close #4934

@oliver-sanders - any problem with nailing this now?

Requirements check-list

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• Applied any dependency changes to both setup.cfg and conda-environment.yml.
• Appropriate tests are included (unit and/or functional).
• No change log entry required (why? e.g. invisible to users).
• No documentation update required.

[oliver-sanders]

@oliver-sanders - any problem with nailing this now?

Not at all, but happy to wait for 8.x for this.

[hjoliver]

@oliver-sanders - any problem with nailing this now?

Not at all, but happy to wait for 8.x for this.

But it's a trivial change, done already, and fixes a bug - so let's get it in! [I want to nail as many easy-to-fix user-facing bugs as possible before 8.0]

[hjoliver]

(Probably one of the few situations where it's fine to catch all exceptions IMO - but can try to be specific if needed.)

[oliver-sanders]

I think this is fine here, sometimes you need to catch anything.

[oliver-sanders]

Looks fine, tried out manually, test failed CI and needs some bodging.

[hjoliver]

CI fixed - the new test should have had a run_fail on the clean command.

[datamel]

Checked out, tests run. No problems spotted. Thanks @hjoliver.