[JUNGFRAU] [DARK] Clearer error message when no suitable files

Description

The error when this is launched with the wrong run (with no JUNGFRAU data) was cryptic and unhelpful (IndexError: range object index out of range). This adds a more informative error message in the report.

How Has This Been Tested?

Re-ran a failed example with this change. PDF report before vs PDF report after.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the code style of this project.

Reviewers

@ahmedk @schmidtp

The CI failure is not related to your changes, so that's sad, but still LGTM.

I think it would be difficult to validate inputs from the webservice, doing it per detector seems more reasonable, even though we're launching a job.
Moreover, this will nicely put MyMDC in error.

Interesting what is this CI failure about? is there an issue or MR related?

It appears that the CFEL guys have removed their cfelpyutils pacakage from PyPI.

It's back, and I've re-launched the CI, which passes now.

LGTM

mentioned in commit fbe8f7a3

merged

changed milestone to %3.4.2