Delete breakout rooms leaves participants with "The conversation does not exist"

[bentuna]

Steps to reproduce

1. User A: Create breakout rooms and click the "Start session" button.
2. User B: join a breakout room.
3. User A: Click the gear button to display the "Manage breakout rooms" modal.
4. Click "Delete breakout rooms" and confirm.
5. User B: See how your are still in a nonexistent room and see "The conversation does not exist - Join a conversation or start a new one!"

Expected behaviour

User B (and all users in all breakout rooms) should be automatically redirected to the main room and automatically join the main call again - so they don't get lost.

Actual behaviour

User B is redirected to /apps/spreed/not-found.

Talk app

Talk app version: 22.0.10

Nextcloud Version: 32.0.6

[nickvergessen]

Sounds like a sane idea