[Bug] API returns 403 with error "index out of bound" when calling a playlist with 0 videos

[WalsGit]

Describe the bug
When I make a api call to an existing playlist https://myinstance.tld/api/v1/auth/playlists/{playlist id} that has no videos in it return a 403 error with { "error": "Index out of bounds" }

Steps to Reproduce
I'm using the api call in a function for my userscript, but I tried it directly in the address bar of my browser and had the same result:

1. logged in to my instance
2. removed all videos from an existing playlist
3. made the api call in the browser using the playlist id
4. got the json with error mentioned.
5. added a video to the playlist
6. remade the api call
7. got the proper callback (all ok)
8. created a new playlist without adding a video to it
9. made a new api call with the new playlist's id
10. got the error
11. added a video to the new playlist
12. remade the api call
13. and all is good again.

Additional context
As I said, it seems to be happening to only empty playlists. As I said I'm using this api call to check if a playlist exists or not (it doesn't matter if it has no videos) and I think this error shouldn't be there for an existing playlist and I should be getting the playlist's object with the videoCount set to 0.