Display of stats buggy if stats are deactivated

Steps to reproduce

1. Deactivate "Enable usage and activity stats in nodeinfo endpoints"
2. Go to '/about'
3. The stat list should not be displayed if the data is not available, see screenshot.

Funkwhale version(s) affected: 0.19

added StatusNeeds triage TypeBug labels

Indeed, let's include a fix for that in the next bugfix release!

changed milestone to %0.19.1

added AreaFrontend label and removed StatusNeeds triage label

mentioned in commit b5678681

mentioned in merge request !780 (merged)

assigned to @eliotberriot

mentioned in commit 0170b4f0

closed via commit b5678681