Merge pull request #6321 from spalger/fix/promise-reject-value

[ui/promises] rejection values should be instances of Error

src/ui/public/promises/promises.js

@@ -71,7 +71,7 @@ module.service('Promise', function ($q, $timeout) {
   });
   Promise.try = function (fn, args, ctx) {
     if (typeof fn !== 'function') {
-      return Promise.reject('fn must be a function');
+      return Promise.reject(new TypeError('fn must be a function'));
     }
 
     var value;