Forgot about NullDebugEvent changes necessary to make unit tests pass

src/main/java/net/floodlightcontroller/debugevent/NullDebugEvent.java

@@ -118,10 +118,23 @@ public class NullDebugEvent implements IFloodlightModule, IDebugEventService {
                           String eventDescription, EventType eventType,
                           Class<T> eventClass, int bufferCapacity,
                           String... metaData) throws MaxEventsRegistered {
-        // TODO Auto-generated method stub
-        return null;
+        return new NullEventImpl<T>();
     }
 
+    public class NullEventImpl<T> implements IEventUpdater<T> {
+
+        @Override
+        public void updateEventNoFlush(Object event) {
+            // TODO Auto-generated method stub
+
+        }
 
+        @Override
+        public void updateEventWithFlush(Object event) {
+            // TODO Auto-generated method stub
+
+        }
+
+    }
 
 }

src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkDiscoveryManager.java

@@ -1996,6 +1996,9 @@ public class LinkDiscoveryManager implements IOFMessageListener,
         this.ignoreMACSet = Collections.newSetFromMap(
                                 new ConcurrentHashMap<MACRange,Boolean>());
         this.haListener = new HAListenerDelegate();
+        registerLinkDiscoveryDebugCounters();
+        registerLinkDiscoveryDebugEvents();
+
     }
 
     @Override
@@ -2049,9 +2052,6 @@ public class LinkDiscoveryManager implements IOFMessageListener,
                       + "switch table {}", SWITCH_CONFIG_TABLE_NAME);
         }
 
-        registerLinkDiscoveryDebugCounters();
-        registerLinkDiscoveryDebugEvents();
-
         ScheduledExecutorService ses = threadPool.getScheduledExecutor();
 
         // To be started by the first switch connection
@@ -2155,7 +2155,6 @@ public class LinkDiscoveryManager implements IOFMessageListener,
         if (debugEvents == null) {
             log.error("Debug Event Service not found.");
             debugEvents = new NullDebugEvent();
-            return;
         }
 
         try {