No error message by clicking on document link in notification mail

[techAPJ (Arpit Jalan)]

@codinghorror

I assume this is only an issue if “prevent anon downloads” is set in site settings?

Yes, that is true. I can only repro it with setting prevent anons from downloading files enabled.

Should I go ahead and replace blank 404 page with our generic error page? PR here:

https://github.com/discourse/discourse/pull/4876