We should distinguish better between errors (CirrusSearch is down, the recommendation engine crashed, API gave a 503, etc.) and empty responses (you don't have any edits to the main namespace, we could not find any pages similar to your last edit).

They should be handled differently at both the API (because if the data isn't preserved there, it can't be used later) and UI layer.

This should be dealt with, but is not a blocker for the release.

Version: master
Severity: normal