Add missing fail() invocation

Added missing fail() call-out in the versatile flow objective handler in
OFDPA2Pipeline.java to cover the case when neither a nextId nor a
treatment is provided.

Change-Id: Ic73e614c141281ff0014a8055d35183b7c3abd4e

@@ -645,6 +645,7 @@ public class OFDPA2Pipeline extends AbstractHandlerBehaviour implements Pipeline
         if (fwd.nextId() == null && fwd.treatment() == null) {
             log.error("Forwarding objective {} from {} must contain "
                     + "nextId or Treatment", fwd.selector(), fwd.appId());
+            fail(fwd, ObjectiveError.BADPARAMS);
             return Collections.emptySet();
         }