bug#63794: Bad error reporting in case of 404 during downloading

[Maxime Devos]

I think I saw it again after upgrading but I might have misremembered.

> I think this report is about two issues:
>
> 1. the substitute error,
> 2. the way the error is reported.
>
> About #1, clearing the cache seems fixing.

IMO this manual action of having to clear the cache (in a new Guix) to 
work-around remainders of a bug in old guix should be unnecessary.

I consider having to do this a bug.

Also, I keep not receiving e-mails in my e-mail client.

Greetings,
Maxime.

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