Bug: No feedback when acessing protected or invalid notebook IDs

Access invalid or inaccessible notebook ID (e.g. https://observablehq.com/d/eb0f603814a2719c)

Expected result:
Page shows 404 Not Found

Actual result:
Page stays blank, shows banner “Welcome. This is live code! Click the left margin to view or edit.”.

An initial test actually resulted in an exception loop that spammed analytics and resulted in 100% CPU usage. I wasn’t able to reproduce this case, though.


Apologies for having broken the 404 page. It should now be working again (or not working, depending on your point of view) just as before.