If app is not found while app view is visible, go back

src/views/app.js

@@ -959,6 +959,7 @@ angular.module('Application').controller('AppController', ['$scope', '$location'
         callback = callback || function () {};
 
         Client.getApp($scope.app.id, function (error, app) {
+            if (error && error.statusCode === 404) return $location.path('/apps');
             if (error) return callback(error);
 
             // Immediately move to debug view on error