ONOS-1376 FIxed error in app command to report bad usage better.

Change-Id: Ib1a6c68cbe9fdef15c0b6b5c7e427999b6b39bdd
diff --git a/cli/src/main/java/org/onosproject/cli/app/ApplicationCommand.java b/cli/src/main/java/org/onosproject/cli/app/ApplicationCommand.java
index 862e27e..4a0a9e0 100644
--- a/cli/src/main/java/org/onosproject/cli/app/ApplicationCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/app/ApplicationCommand.java
@@ -61,6 +61,8 @@
                 service.activate(appId);
             } else if (command.equals(DEACTIVATE)) {
                 service.deactivate(appId);
+            } else {
+                print("Unsupported command: %s", command);
             }
         }
     }