scripts: pull: Handle EPIPE errors when displaying help.
Reported by Mathieu Othacehe <othacehe@gnu.org>. * guix/scripts/pull.scm (%options): Handle EPIPE errors when displaying help.
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			@ -201,7 +201,7 @@ Download and deploy the latest version of Guix.\n"))
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         (option '(#\h "help") #f #f
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                 (lambda args
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                   (show-help)
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                   (leave-on-EPIPE (show-help))
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                   (exit 0)))
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         (option '(#\V "version") #f #f
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                 (lambda args
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