Make sure there are no ugly edge cases running Riot without an integrations manager #431
Description
From riot-ios created by manuroe: element-hq/element-ios#2518
From riot-web created by lampholder: element-hq/element-web#10090
Edge cases we need to manage (display an error or hide the feature):
- integration manager screen
- Sticker picker
- jitsi conf call
Fixed in Riot-web by matrix-org/matrix-react-sdk#3115