Fix unsupported headers and status of undefined

Author: André Coelho

src/interceptors/oauth-interceptor.js

@@ -16,6 +16,10 @@ function oauthInterceptor($q, $rootScope, OAuthToken) {
       return config;
     },
     responseError: function(rejection) {
+      if (!rejection) {
+        return $q.reject(rejection);
+      }
+
       // Catch `invalid_request` and `invalid_grant` errors and ensure that the `token` is removed.
       if (400 === rejection.status && rejection.data &&
         ('invalid_request' === rejection.data.error || 'invalid_grant' === rejection.data.error)
@@ -29,7 +33,7 @@ function oauthInterceptor($q, $rootScope, OAuthToken) {
       // The token isn't removed here so it can be refreshed when the `invalid_token` error occurs.
       if (401 === rejection.status &&
         (rejection.data && 'invalid_token' === rejection.data.error) ||
-        (rejection.headers('www-authenticate') && 0 === rejection.headers('www-authenticate').indexOf('Bearer'))
+        (rejection.headers && rejection.headers('www-authenticate') && 0 === rejection.headers('www-authenticate').indexOf('Bearer'))
       ) {
         $rootScope.$emit('oauth:error', rejection);
       }