The user can update a meeting with empty body

[vsperiatu]

Describe the bug

When creating a meeting it is mandatory to have the body completed. After I created it, I can go and edit it and leave the body empty and the meeting is saved without a body. Also, this is happening only when rich text editor is activated.

To Reproduce

1. Log in as admin and activate the rich text editor (Organization settings -> Enable rich text editor for participants)
2. Visit the main site
3. Create a meeting
4. Complete all mandatory fields (including the body)
5. Save
6. Click on 'Edit meeting'
7. Delete the text from the body
8. Save

Expected behavior

The user should not be able to save the meeting without filling the body.

Screenshots

save_meeting_without_body.mp4

Stacktrace

No response

Extra data

Tested on nightly

Additional context

No response