Ensure we callback if the request was killed by the browser

src/js/client.js

@@ -33,7 +33,7 @@ angular.module('Application').service('Client', ['$http', '$interval', 'md5', 'N
             // handle request killed by browser (eg. cors issue)
             if (data === null && status === -1) {
                 client.offline = true;
-                return;
+                return callback(new ClientError('Request cancelled by browser'));
             }
 
             if (status === 401) return client.login();