Merge pull request #330 from stormpath/fix-refresh-token-auth-error-handling

Fix: Remove refresh_token option validation in refresh grant authenticator

Author: Timothy E. Johansson

lib/oauth/refresh-grant.js

@@ -27,8 +27,6 @@ OAuthRefreshTokenGrantAuthenticator.prototype.authenticate = function authentica
   var application = this.application;
   if(arguments.length !==2 ){
     throw new Error('Must call authenticate with (data,callback)');
-  }else if (!data.refresh_token){
-    throw new Error('data does not have refresh_token property');
   }else{
     var href = application.href + '/oauth/token';
     var formData = {