remove the catch altogether from authenticate

lib/sequelize.js

@@ -931,9 +931,7 @@ Sequelize.prototype.drop = function(options) {
  * @return {Promise}
  * @return {Promise}
  */
  */
 Sequelize.prototype.authenticate = function(options) {
 Sequelize.prototype.authenticate = function(options) {
-  return this.query('SELECT 1+1 AS result', Utils._.assign({ raw: true, plain: true }, options)).return().catch(function(err) {
-    throw err;
-  });
+  return this.query('SELECT 1+1 AS result', Utils._.assign({ raw: true, plain: true }, options)).return();
 };
 };
 
 
 Sequelize.prototype.databaseVersion = function(options) {
 Sequelize.prototype.databaseVersion = function(options) {