Give info when unable to load list of repos

[smutel]

This PR is a workaround for #428.

Requirements

All new code should be covered with tests, documentation should be updated. CI should pass.

Description of the Change

The idea is to have information about publish which is in trouble and to be able to drop it and to re-publish it.

Checklist

• unit-test added (if change is algorithm)
• functional test added/updated (if change is functional)
• man page updated (if applicable)
• bash completion updated (if applicable)
• documentation updated
• author name in AUTHORS

[randombenj]

Thanks for the change. I would suggest to print those messages to stderr as, especially when printing json, this might break existing scripts trying to parse the output. What do you think @smutel ?

[smutel]

Sure. I updated my PR.

[randombenj]

LGTM