Releases showing empty when fetching the channel map/revision details fails

[Saviq]

Expected behaviour

E.g. https://snapcraft.io/ubuntu-frame/releases shows the releases for the snap.

Steps to reproduce the problem

Go to https://snapcraft.io/ubuntu-frame/releases when there's a high load, or block some URLs in your browser / proxy.

See empty boxes instead of an error report about the fetching of the details.

Specs

• URL: https://snapcraft.io/ubuntu-frame/releases

• Operating system: N/A

• Browser: N/A

• [x] This issue is related to the snapcraft.io website itself (and not a specific snap).