config_service: change error message for error 403.

appengine/config_service/ui/src/config-ui/front-page.html

 <!--
   Copyright 2017 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
 -->
 
 <link rel="import" href="../../bower_components/app-layout/app-layout.html">
 <link rel="import" href="../../bower_components/iron-ajax/iron-ajax.html">
 <link rel="import" href="../../bower_components/paper-button/paper-button.html">
 <link rel="import" href="../../bower_components/paper-search/paper-search-bar.html">
@@ skipping 115 matching lines @@
         },
 
         query: {
           type: String,
           observer: '_updateSearchResults'
         },
 
         searchResults: {
           type: Array,
           value: () => []
+        },
+
+        signed_in: {
+          type: Boolean,
+          observer: '_onSignIn'
         }
       },
 
       ready: function() {
-        document.addEventListener('fetch-configs', function() {
+        if (!this.initialized) {
+          document.addEventListener('fetch-configs', function() {
+            this.$.requestConfigs.generateRequest();
+          }.bind(this));
+        } else {
+          this.$.requestConfigs.generateRequest();
+        }
+      },
+
+      _onSignIn: function() {
+        if (this.signed_in) {
           this.isLoading = true;
           this.$.requestConfigs.generateRequest();
-        }.bind(this));
+        }
       },
 
       _formatName: function(name) {
         var tempName = name.substring(name.indexOf("/") + 1);
         return tempName.includes("/") ?
             tempName.substring(0, tempName.indexOf("/")) : tempName;
       },
 
       _getLastImportAttempt: function(lastImportAttempt) {
         if (lastImportAttempt) {
@@ skipping 38 matching lines @@
         var tempResults = this.configSetList.filter(e => e.config_set.includes(this.query));
         tempResults.sort(function(a, b) {
           return this._formatName(a.config_set).localeCompare(this._formatName(b.config_set));
         }.bind(this));
         this.searchResults = tempResults;
       },
 
     });
   </script>
 </dom-module>