raco setup: fix corners where db might not exist
raco setup: fix corners where db might not exist

Using something like `raco pkg remove` in an incompletely
set up installation could lead to failures attempting to
access a database file that isn't there.

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket