ONOS-365 Excluding intents with state=null from output.

Change-Id: I96555f6c1483e9d744b7d67bae8d4a221a630f5d

@@ -76,6 +76,7 @@ public class IntentsListCommand extends AbstractShellCommand {
         } else {
             for (Intent intent : service.getIntents()) {
                 IntentState state = service.getIntentState(intent.id());
+                if (state != null) {
                     print("id=%s, state=%s, type=%s, appId=%s",
                           intent.id(), state, intent.getClass().getSimpleName(),
                           intent.appId().name());
@@ -83,6 +84,7 @@ public class IntentsListCommand extends AbstractShellCommand {
                 }
             }
         }
+    }
 
     /**
      * Internal local class to keep track of all intent summaries.