Topo2: Updated selection model

Change-Id: Ib5c953b1a79fe516c1407971b8134e1425958215
diff --git a/web/gui/src/main/webapp/app/view/topo2/topo2Force.js b/web/gui/src/main/webapp/app/view/topo2/topo2Force.js
index 89fbae4..55b5baa 100644
--- a/web/gui/src/main/webapp/app/view/topo2/topo2Force.js
+++ b/web/gui/src/main/webapp/app/view/topo2/topo2Force.js
@@ -206,6 +206,10 @@
             t2tbs = _t2tbs_;
 
             var onZoom = function () {
+                if (!t2rs.isLoadComplete()) {
+                    return;
+                }
+
                 var nodes = [].concat(
                         t2rs.regionNodes(),
                         t2rs.regionLinks()