Fixes NPE in route manager and activates probing.

Change-Id: I1138a5ee60d9709a100f269d03f789c76fdfcbfe
diff --git a/incubator/net/src/main/java/org/onosproject/incubator/net/routing/impl/RouteManager.java b/incubator/net/src/main/java/org/onosproject/incubator/net/routing/impl/RouteManager.java
index 7902473..5f3640b 100644
--- a/incubator/net/src/main/java/org/onosproject/incubator/net/routing/impl/RouteManager.java
+++ b/incubator/net/src/main/java/org/onosproject/incubator/net/routing/impl/RouteManager.java
@@ -145,9 +145,11 @@
                 if (routes != null) {
                     routes.forEach(route -> {
                         NextHopData nextHopData = routeStore.getNextHop(route.nextHop());
+                        if (nextHopData != null) {
                             l.post(new RouteEvent(RouteEvent.Type.ROUTE_ADDED,
-                                    new ResolvedRoute(route, nextHopData.mac(),
-                                            nextHopData.location())));
+                                                  new ResolvedRoute(route, nextHopData.mac(),
+                                                                    nextHopData.location())));
+                        }
                     });
                 }
             });