Use case: A user might want to have a look at the segments (to see whether they make sense) or the video while an event is being processed.
Steps to reproduce:
1. Open the video editor for an event that is being processed
The video editor will open but not display any information as metadata, segments, waveform, video preview, etc.
The video editor should display all information (but not allow users to change the information)
When asked to deliver editor.json that contains all the required information, the backend checks whether the event has the source "ARCHIVE". While being processing, the source of the event is set to "WORKFLOW".
If the source is not set to "ARCHIVE", the endpoint simply returns a 404 NOT FOUND.
This doesn't actually make sense as it is a GET request (nothing will be written/changed) and the user already has opened the video editor anyway.
-> I don't see much reason why the backend should not just return the information it has.