Invalid project link shows 500 error page instead of 404

[JulianVennen]

Please confirm the following.

• I checked the existing issues for duplicate problems
• I have tried resolving the issue using the support portal

What browsers are you seeing the problem on?

Chrome (including Arc, Brave, Opera, Vivaldi)

Describe the bug

Opening any project URL that doesn't exist shows error code 500 instead of 404

Steps to reproduce

1. Go to https://modrinth.com/mod/sadasdasd
2. See error code 500

Expected behavior

Invalid project pages should show a 404 message, not a generic error message

Additional context

No response