bug#46104: backtrace in guix-weather on unsupported package

[Efraim Flashner <efraim@flashner.co.il>]

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GHC isn't available for aarch64, only i686-linux and x86_64-linux.

(ins)efraim@3900XT ~/workspace/guix$ guix weather ghc --system=aarch64-linux
computing 0 package derivations for aarch64-linux...
looking for 0 store items on https://ci.guix.gnu.org...
https://ci.guix.gnu.org
Backtrace:
           8 (primitive-load "/home/efraim/.config/guix/current/bin/…")
In guix/ui.scm:
  2154:12  7 (run-guix-command _ . _)
In ice-9/boot-9.scm:
  1736:10  6 (with-exception-handler _ _ #:unwind? _ # _)
  1731:15  5 (with-exception-handler #<procedure 7f90c690a0c0 at ic…> …)
In guix/scripts/weather.scm:
    546:9  4 (_)
In guix/build/utils.scm:
   569:23  3 (every* #<procedure 7f90b94abe10 at guix/scripts/weath…> …)
In guix/scripts/weather.scm:
   547:19  2 (_ "https://ci.guix.gnu.org")
   197:22  1 (_ _ ())
In ice-9/boot-9.scm:
  1669:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1669:16: In procedure raise-exception:
Throw to key `numerical-overflow' with args `("/" "Numerical overflow" #f #f)'.

-- 
Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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