revert the exception printing in Task
diff --git a/hyracks/hyracks-control/hyracks-control-nc/src/main/java/edu/uci/ics/hyracks/control/nc/Task.java b/hyracks/hyracks-control/hyracks-control-nc/src/main/java/edu/uci/ics/hyracks/control/nc/Task.java
index 1a1d41e..09eeab6 100644
--- a/hyracks/hyracks-control/hyracks-control-nc/src/main/java/edu/uci/ics/hyracks/control/nc/Task.java
+++ b/hyracks/hyracks-control/hyracks-control-nc/src/main/java/edu/uci/ics/hyracks/control/nc/Task.java
@@ -320,10 +320,8 @@
                 collector.close();
             }
         } catch (HyracksException e) {
-            e.printStackTrace();
             throw new HyracksDataException(e);
         } catch (Exception e) {
-            e.printStackTrace();
             throw new HyracksDataException(e);
         }
     }