Enable link functionality in GUI2 Topology View

Change-Id: I1b88080ecdf8c9b6f8a60af4832a12441186d508
diff --git a/web/gui2/src/main/webapp/app/view/topology/topology/topology.component.html b/web/gui2/src/main/webapp/app/view/topology/topology/topology.component.html
index d72a2e0..2a654b7 100644
--- a/web/gui2/src/main/webapp/app/view/topology/topology/topology.component.html
+++ b/web/gui2/src/main/webapp/app/view/topology/topology/topology.component.html
@@ -22,9 +22,9 @@
 
 <div id="ov-topo2">
     <svg:svg #svgZoom xmlns:svg="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000" id="topo2">
-        <svg:g onos-nodeviceconnected />
+        <svg:g *ngIf="force.regionData?.devices.length === 0" onos-nodeviceconnected />
         <svg:g id="topo-zoomlayer" onosZoomableOf [zoomableOf]="svgZoom">
-            <svg:g #background onos-backgroundsvg/>
+            <svg:g *ngIf="showBackground" onos-backgroundsvg/>
             <svg:g #force onos-forcesvg (selectedNodeEvent)="nodeSelected($event)"/>
         </svg:g>
     </svg:svg>