proper priority for error over warning also for node_status (see 9c5220e05e04);

--- a/src/Pure/PIDE/protocol.scala	Sat Aug 02 16:35:59 2014 +0200
+++ b/src/Pure/PIDE/protocol.scala	Sat Aug 02 19:29:02 2014 +0200
@@ -145,8 +145,8 @@
       val status = Status.merge(states.iterator.map(_.protocol_status))
 
       if (status.is_running) running += 1
+      else if (status.is_failed) failed += 1
       else if (status.is_warned) warned += 1
-      else if (status.is_failed) failed += 1
       else if (status.is_finished) finished += 1
       else unprocessed += 1
     }