FIX: Show error message, not exception page, to mods

assets/javascripts/discourse/routes/admin-plugins-explorer.js.es6

@@ -6,18 +6,17 @@ export default Discourse.Route.extend({
   model() {
     const p1 = this.store.findAll('query');
     const p2 = Discourse.ajax('/admin/plugins/explorer/schema.json', {cache: true});
-    return p1.then(function(model) {
-      model.forEach(function(query) {
-        query.markNotDirty();
-      });
-      return p2.then(function(schema) {
-        return { content: model, schema: schema };
-      });
+    return p1.then(model => {
+      model.forEach(query => query.markNotDirty());
+
+      return p2.then(schema => {return {model, schema};});
+    }).catch(() => {
+      p2.catch(() => {});
+      return { model: null, schema: null, disallow: true };
     });
   },
 
   setupController: function(controller, model) {
-    controller.set('model', model.content);
-    controller.set('schema', model.schema);
+    controller.setProperties(model);
   }
 });

assets/javascripts/discourse/templates/admin/plugins-explorer.hbs

@@ -1,3 +1,6 @@
+{{#if disallow}}
+  <h2>{{i18n "explorer.admins_only"}}</h2>
+{{else}}
   <div class="query-list">
     {{combo-box valueAttribute="id" value=selectedQueryId nameProperty="listName" content=content castInteger="true" nameChanges="true"}}
     {{d-button action="showCreate" icon="plus" class="no-text"}}
@@ -129,3 +132,5 @@
   {{/unless}}
 
   <div class="explorer-pad-bottom"></div>
+
+{{/if}}

config/locales/client.en.yml

@@ -22,6 +22,7 @@ en:
         no_semicolons: "Remove the semicolons from the query."
         dirty: "You must save the query before running."
     explorer:
+      admins_only: "The data explorer is only available to admins."
       title: "Data Explorer"
       create: "Create New"
       create_placeholder: "Query name..."