[Haskell-cafe] avoid to print empty string

[Damien Mattei]

i have this in a Monad IO:

 forM_ fltrdNamesBDs $ \(name,bdSidonie,bdWDS) ->
          if (bdWDS /= bdSidonie)
          then
             putStrLn $  name ++ " " ++ (show (bdSidonie :: Maybe Float))
++ " " ++ show (bdWDS :: Maybe Float) ++ " " ++ show (bdWDS == bdSidonie)
          else
             putStr ""

is there a way to remove the silly putStr "" that output an empty string, i
tried with when.... but as when return Nothing in case of False it fails to
compile
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