Adding more topology manager/store implementation.
diff --git a/core/trivial/src/main/java/org/onlab/onos/net/trivial/impl/SimpleHostManager.java b/core/trivial/src/main/java/org/onlab/onos/net/trivial/impl/SimpleHostManager.java
index 05557c5..3152209 100644
--- a/core/trivial/src/main/java/org/onlab/onos/net/trivial/impl/SimpleHostManager.java
+++ b/core/trivial/src/main/java/org/onlab/onos/net/trivial/impl/SimpleHostManager.java
@@ -158,7 +158,7 @@
 
     // Posts the specified event to the local event dispatcher.
     private void post(HostEvent event) {
-        if (event != null && eventDispatcher != null) {
+        if (event != null) {
             eventDispatcher.post(event);
         }
     }