Handle 404s on jobs

ui/app/routes/jobs/job.js

@@ -1,4 +1,5 @@
 import Ember from 'ember';
+import notifyError from 'nomad-ui/utils/notify-error';
 
 const { Route, inject } = Ember;
 
@@ -10,6 +11,7 @@ export default Route.extend({
       .find('job', job_id)
       .then(job => {
         return job.get('allocations').then(() => job);
-      });
+      })
+      .catch(notifyError(this));
   },
 });

ui/app/utils/notify-error.js

@@ -0,0 +1,7 @@
+// An error handler to provide to a promise catch to set an error
+// on the application controller.
+export default function notifyError(route) {
+  return error => {
+    route.controllerFor('application').set('error', error);
+  };
+}