Add link to dblog if enabled

Working on it.

Made the required changes. Please review MR !704.

Made the changes requested. Please review.

Gave this a quick manual testing using the error-forcing method described in the issue summary.

Without dblog enabled, I see this when fetching modules:

And with it:

That's pretty straightforwardly what I'd expect. The "error log" link takes me to the error log as promised, and the first thing in it is the HTTP error that came back from d.o. Definitely useful for forensic purposes.

I'd say this is pretty clearly good to go.

nice little ux improvement here!

Automatically closed - issue fixed for 2 weeks with no activity.