GUI -- TopoView - Reimplemented 'traffic' related functionality.

Change-Id: I86d16324e4ce2cd2e0eb8d8f48f72804d7ce101f
diff --git a/web/gui/src/main/webapp/app/view/topo/topoModel.js b/web/gui/src/main/webapp/app/view/topo/topoModel.js
index de31eef..b1f02ae 100644
--- a/web/gui/src/main/webapp/app/view/topo/topoModel.js
+++ b/web/gui/src/main/webapp/app/view/topo/topoModel.js
@@ -376,9 +376,12 @@
                 dim = _dim_;
             }
 
+            function destroyModel() { }
+
             return {
                 initModel: initModel,
                 newDim: newDim,
+                destroyModel: destroyModel,
 
                 positionNode: positionNode,
                 createDeviceNode: createDeviceNode,