[racket] DrRacket package suggestions

Hi all,

I seem to recall that a while ago DrRacket started to suggest packages
to install when you had `require`s that failed to load any modules, but
I can't seem to figure out how to trigger this anymore.

Was this disabled at some point? I see that the code from this commit:
  https://github.com/plt/racket/commit/3474d0913873058d60baeb8237e5c02f5b0ab1f1

still seems to be in DrRacket and parts of it are still called (verified
via printf), but I don't actually see any suggestions. Am I missing
something obvious?

Cheers,
Asumu