bug#58497: opam import doesn't work with ocaml_intrinsics among others

[Csepp]

The error might not be the same for others, I have a slightly patched
opam->guix-package function.

guix import opam ocaml_intrinsics
Backtrace:
In ice-9/boot-9.scm:
  1752:10 10 (with-exception-handler _ _ #:unwind? _ # _)
In unknown file:
           9 (apply-smob/0 #<thunk 7ff952d2f2e0>)
In ice-9/boot-9.scm:
    724:2  8 (call-with-prompt _ _ #<procedure default-prompt-handle…>)
In ice-9/eval.scm:
    619:8  7 (_ #(#(#<directory (guile-user) 7ff952d34c80>)))
In guix/ui.scm:
   2263:7  6 (run-guix . _)
  2226:10  5 (run-guix-command _ . _)
In guix/scripts/import.scm:
    92:11  4 (guix-import . _)
In guix/scripts/import/opam.scm:
   105:24  3 (guix-import-opam . _)
In guix/import/opam.scm:
   385:24  2 (opam->guix-package _ #:repo _ #:version _)
In guix/import/utils.scm:
   290:27  1 (beautify-description #f _)
In unknown file:
           0 (string-trim-both #f #<undefined> #<undefined> #<undefi…>)

ERROR: In procedure string-trim-both:
In procedure string-trim-both: Wrong type argument in position 1 (expecting 
string): #f