clean up visuals on error index

[steveklabnik]

Specifically, the notice about not being emitted anymore

This is functional, but could look much nicer.

[jdhorwitz]

@steveklabnik I could take this one and start working on it.

[steveklabnik]

That'd be great!

[steveklabnik]

#40502 will fix this

[steveklabnik]

PR was merged, this can be closed!