bug#33323: guix package (--show & --search) missing error when package is not found

[swedebugia]

Hi

$ guix package --show=test
(no output)

Expected: error package test not found

+ you can help package it by reading the XX section in the manual

The relevant code begins on line 771 (in guix/scripts/package.scm):

      (('show requested-name)
       (let-values (((name version)
                     (package-name->name+version requested-name)))
         (leave-on-EPIPE
          (for-each (cute package->recutils <> (current-output-port))
                    (find-packages-by-name name version)))
         #t))

Maybe we could catch this in the buttom of the procedure if the output 
is null?

--
Cheers
Swedebugia