fix service alias issue

app/components/edit-dns/template.hbs

@@ -50,7 +50,7 @@
         {{#if (eq mode "dnsservice")}}
           {{form-targets
             isBalancer=false
-            existing=existing
+            existing=record
             exclude=service.id
             changed=(action "setTargetServices")
           }}

app/components/form-targets/component.js

@@ -35,7 +35,7 @@ export default Ember.Component.extend({
     var out = [];
 
     var existing = this.get('existing');
-    if ( existing )
+    if ( existing && existing.get('linkedServices'))
     {
       let links = existing.get('linkedServices');
       Object.keys(links).forEach((key) => {