bug#47941: guix lint -c cve stacktrace

[Jack Hill <jackhill@jackhill.us>]

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Hi Guix,

Using guix ae5128e21eb7afa66bd7cfd7fd1bc5764d00663e, the cve lint check 
fails when fetching the CVE database as follows:

$ guix lint -c cve hello
fetching CVE database for 2021...
Backtrace:
           15 (primitive-load "/home/jackhill/.config/guix/current/bi…")
In guix/ui.scm:
   2164:12 14 (run-guix-command _ . _)
In ice-9/boot-9.scm:
   1736:10 13 (with-exception-handler _ _ #:unwind? _ # _)
   1731:15 12 (with-exception-handler #<procedure 7f895ab7d000 at ic…> …)
In srfi/srfi-1.scm:
     634:9 11 (for-each #<procedure 7f895ab84d80 at guix/scripts/lin…> …)
In guix/scripts/lint.scm:
      65:4 10 (run-checkers _ _ #:store _)
In srfi/srfi-1.scm:
     634:9  9 (for-each #<procedure 7f895420bc00 at guix/scripts/lin…> …)
In guix/scripts/lint.scm:
     74:21  8 (_ _)
In guix/lint.scm:
    1178:4  7 (check-vulnerabilities _ _)
    1170:9  6 (_ _)
In unknown file:
            5 (force #<promise #<procedure 7f895af13a88 at guix/lint.…>)
In guix/lint.scm:
    1153:2  4 (_)
    1112:2  3 (call-with-networking-fail-safe _ _ _)
In ice-9/boot-9.scm:
   1736:10  2 (with-exception-handler _ _ #:unwind? _ # _)
   1669:16  1 (raise-exception _ #:continuable? _)
   1667:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1667:16: In procedure raise-exception:
Wrong type (expecting array): #f

Best,
Jack