'guix download' outputs a backtrace when daemon isn't running

[Nikita Karetnikov]

# ./pre-inst-env guix download http://example.com

Backtrace:
In ice-9/boot-9.scm:
 157: 8 [catch #t #<catch-closure 8ab6ef0> ...]
In unknown file:
   ?: 7 [apply-smob/1 #<catch-closure 8ab6ef0>]
In ice-9/boot-9.scm:
  63: 6 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 5 [eval # #]
In ice-9/boot-9.scm:
2320: 4 [save-module-excursion #<procedure 8a48e80 at ice-9/boot-9.scm:3961:3 
()>]
3966: 3 [#<procedure 8a48e80 at ice-9/boot-9.scm:3961:3 ()>]
In unknown file:
   ?: 2 [load-compiled/vm 
"/root/.cache/guile/ccache/2.0-LE-4-2.0/home/guix-test2/scripts/guix.go"]
In guix/ui.scm:
 419: 1 [guix-main "/home/guix-test2/scripts/guix" "download" 
"http://example.com";]
In unknown file:
   ?: 0 [# "failed to connect to `~a': ~a~%" ...]

ERROR: In procedure #<syntax-transformer leave>:
ERROR: Wrong type to apply: #<syntax-transformer leave>

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