Use isNothing.
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1 changed files with 2 additions and 2 deletions
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@ -413,8 +413,8 @@ convertWithOpts opts = do
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mconcat <$> mapM (readFile' >=> r readerOpts) sources
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metadata <- if format == "jats" &&
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lookup "csl" (optMetadata opts) == Nothing &&
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lookup "citation-style" (optMetadata opts) == Nothing
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isNothing (lookup "csl" (optMetadata opts)) &&
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isNothing (lookup "citation-style" (optMetadata opts))
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then do
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jatsCSL <- readDataFile datadir "jats.csl"
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let jatsEncoded = makeDataURI ("application/xml", jatsCSL)
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