Fixing styles

Change-Id: Ic4c8a4f69816208b5266b86fdf6bcc4ed63c41f4
diff --git a/src/app/service-graph/services/graph.store.ts b/src/app/service-graph/services/graph.store.ts
index 0ed0960..1bb5d4c 100644
--- a/src/app/service-graph/services/graph.store.ts
+++ b/src/app/service-graph/services/graph.store.ts
@@ -253,6 +253,11 @@
       const sourceId = this.getSourceId(tenant);
       const targetId = this.getTargetId(tenant);
 
+      if (!angular.isDefined(targetId)) {
+        // if the tenant is not pointing to anything, don't draw links
+        return links;
+      }
+
       const tenantToProvider = {
         id: `${sourceId}_${tenant.d3Id}`,
         source: this.getNodeIndexById(sourceId, nodes),