ui: Fixup displaying a Nspace default policy when expanding the preview pane (#12316)

.changelog/12316.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+ui: Ensure we always display the Policy default preview in the Namespace editing form
+```

ui/packages/consul-ui/app/serializers/nspace.js

@@ -2,22 +2,12 @@ import Serializer from './application';
 import { get } from '@ember/object';
 import { PRIMARY_KEY, SLUG_KEY } from 'consul-ui/models/nspace';
 
-export default class NspaceSerializer extends Serializer {
-  primaryKey = PRIMARY_KEY;
-  slugKey = SLUG_KEY;
-
-  respondForQuery(respond, query, data, modelClass) {
-    return super.respondForQuery(
-      cb =>
-        respond((headers, body) =>
-          cb(
-            headers,
-            body.map(function(item) {
-              item.Namespace = '*';
-              item.Datacenter = query.dc;
+const normalizeACLs = item => {
   if (get(item, 'ACLs.PolicyDefaults')) {
     item.ACLs.PolicyDefaults = item.ACLs.PolicyDefaults.map(function(item) {
+      if (typeof item.template === 'undefined') {
         item.template = '';
+      }
       return item;
     });
   }
@@ -33,6 +23,22 @@ export default class NspaceSerializer extends Serializer {
     }
   });
   return item;
+};
+
+export default class NspaceSerializer extends Serializer {
+  primaryKey = PRIMARY_KEY;
+  slugKey = SLUG_KEY;
+
+  respondForQuery(respond, query, data, modelClass) {
+    return super.respondForQuery(
+      cb =>
+        respond((headers, body) =>
+          cb(
+            headers,
+            body.map(function(item) {
+              item.Namespace = '*';
+              item.Datacenter = query.dc;
+              return normalizeACLs(item);
             })
           )
         ),
@@ -46,7 +52,7 @@ export default class NspaceSerializer extends Serializer {
         respond((headers, body) => {
           body.Datacenter = serialized.dc;
           body.Namespace = '*';
-          return cb(headers, body);
+          return cb(headers, normalizeACLs(body));
         }),
       serialized,
       data
@@ -59,7 +65,7 @@ export default class NspaceSerializer extends Serializer {
         respond((headers, body) => {
           body.Datacenter = serialized.dc;
           body.Namespace = '*';
-          return cb(headers, body);
+          return cb(headers, normalizeACLs(body));
         }),
       serialized,
       data
@@ -68,7 +74,7 @@ export default class NspaceSerializer extends Serializer {
 
   respondForUpdateRecord(respond, serialized, data) {
     return respond((headers, body) => {
-      return body;
+      return normalizeACLs(body);
     });
   }
 }