scripts: copy: Handle EPIPE errors when displaying help.
* guix/scripts/copy.scm (%options): Handle EPIPE errors when displaying help.
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			@ -150,7 +150,7 @@ Copy ITEMS to or from the specified host over SSH.\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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