scripts: size: Handle EPIPE errors when displaying help.
* guix/scripts/size.scm (%options): Handle EPIPE errors when displaying help.
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			@ -278,7 +278,7 @@ Report the size of the PACKAGE or STORE-ITEM, with its dependencies.\n"))
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              %standard-build-options)
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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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