build-system/haskell: Fix regression.
This is a follow-up of a0f880afea3b29e817866de0170ed579738db2d1. * guix/build-system/haskell.scm (haskell-build): Correctly handle the absence of a "cabal-revision" input.
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@ -153,7 +153,7 @@ provides a 'Setup.hs' file as its build system."
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;; use of ungexp-splicing.
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#:cabal-revision
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#$@(match (assoc-ref inputs "cabal-revision")
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(#f '())
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(#f '(#f))
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(lst lst))
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#:configure-flags #$configure-flags
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