LP shows the http:// URL for branches that haven't been published yet.

Checking that "Branch.last_mirrored_id is not None" is what I did to decide whether to show the codebrowse URL. You could do the same here.

I am of two minds about this. Pointing to a URL that contains not useful data "right now" is bad, but on the other hand it might be confusing to hide it. Especially since the mirroring should normally happen in a few minutes.

Maybe it would be better to still display the supermirror URL, but make it clear that it does not contain any data yet...

I agree with David; it's not that we display the URL that's the problem, it's that we imply that the URL is already functioning.

I think this is low priority; for most branches the URL will be functional within a minute or two of the user looking at the page.

The only time inconsistency lasts more than a couple of minutes is when the initial push failed, in which case the page will be displaying an error message more or less saying so (it might not clearly say that because of this error, the "Hosted on Launchpad: http://bazaar..." URL is not functioning, but it's not too hard to guess).