chore: 🤖 add placeholder template for errors

ui/core/app/routes/orgs/org/projects.js

@@ -7,11 +7,7 @@ export default class OrgsOrgProjectsRoute extends Route {
    * Returns all projects from the store.
    * @return {Promise[ProjectModel]}
    */
-  async model() {
-    try {
-      return await this.store.findAll('project');
-    } catch (e) {
-      return [];
-    }
+  model() {
+    return this.store.findAll('project');
   }
 }

ui/core/app/templates/orgs/org/error.hbs

@@ -0,0 +1,39 @@
+{{!--
+  In an error route, the error instance is `@model`.  Error instances contain
+  a list of errors, each of which has one convenience boolean set on it:
+
+  * Error booleans are attached based on the error status code:
+  *
+  *   - `error.isUnauthenticated`:  the session isn't authenticated
+  *   - `error.isForbidden`:  the session is authenticated but does not have
+  *                         permission to perform the requested action
+  *   - `error.isNotFound`:  the requested resource could not be found
+  *   - `error.isServer`:  an internal server error occurred
+  *   - `error.isUnknown`:  an error occurred, but we don't know which or
+  *                   we don't distinguish it yet
+
+--}}
+
+{{#each @model.errors as |error|}}
+
+  {{#if error.isUnauthenticated}}
+    {{!-- error.status === 401 --}}
+  {{/if}}
+
+  {{#if error.isForbidden}}
+    {{!-- error.status === 403 --}}
+  {{/if}}
+
+  {{#if error.isNotFound}}
+    {{!-- error.status === 404 --}}
+  {{/if}}
+
+  {{#if error.isServer}}
+    {{!-- error.status === 500 --}}
+  {{/if}}
+
+  {{#if error.isUnknown}}
+    {{!-- error.status === 🤷 --}}
+  {{/if}}
+
+{{/each}}

ui/core/mirage/config.js

@@ -28,4 +28,8 @@ export default function() {
   this.get('/orgs/:org_id/projects/:project_id/host-catalogs/:id');
   this.patch('/orgs/:org_id/projects/:project_id/host-catalogs/:id');
   this.del('/orgs/:org_id/projects/:project_id/host-catalogs/:id');
+
+  // Uncomment the following line and the Response import above
+  // Then change the response code to simulate error responses
+  //this.get('/orgs/:org_id/projects', () => new Response(401));
 }

ui/core/mirage/serializers/application.js

@@ -1,5 +1,6 @@
 import { RestSerializer } from 'ember-cli-mirage';
 import { underscore } from '@ember/string';
+import { isArray } from '@ember/array';
 
 /**
  * Manages serialization/normalization of data into and out of the mock API.
@@ -38,7 +39,7 @@ export default RestSerializer.extend({
   serialize() {
     let json = RestSerializer.prototype.serialize.apply(this, arguments);
     // If array, root it under a standard `items` key
-    if (json.length) json = {items: json};
+    if (isArray(json)) json = {items: json};
     return json;
   },