Add missing join.

manifests/output.pp

@@ -11,7 +11,7 @@ define mpd::output (
       name "${name}"
     | EOF
 
-  $content_aux = $parameters.map |$k, $v| { "${k} \"${v}\"\n" }
+  $content_aux = $parameters.map |$k, $v| { "${k} \"${v}\"\n" }.join()
 
   concat::fragment { "mpd audio ${name}":
     target  => '/etc/mpd.conf',