[Bug] Cryptic error message for non-existent playlist

[opk12]

Describe the bug
When following an old link found on a website that points to a now-deleted playlist, the error message is Could not extract playlistSidebarRenderer which does not explain the real problem and frames it as an Invidious bug.

Steps to Reproduce

1. Make a playlist.
2. Check that it works on Invidious.
3. Delete the playlist.
4. Open the playlist via Invidious.
5. Read cryptic error message.

[tealamore]

This is the line that causes this message:

invidious/src/invidious/playlists.cr

Line 337 in 08390ac

raise InfoException.new("Could not extract playlistSidebarRenderer.") if !playlist_sidebar_renderer

Seems like we'd just need to change that message to state it's a non-existent playlist