fix(hooks): no longer crashes on hasHook when no hooks are defined, closes #3181

changelog.md

 # Next
 - [BUG] Fixed support for 2 x belongsToMany without foreignKey defined and association getter/adder [#3185](https://github.com/sequelize/sequelize/issues/3185)
+- [BUG] No longer throws on `Model.hasHook()` if no hooks are defiend [#3181](https://github.com/sequelize/sequelize/issues/3181)
 
 # 2.0.3
 - [BUG] Support for plain strings, ints and bools on JSON insert

lib/hooks.js

@@ -169,7 +169,7 @@ Hooks.addHook = function(hookType, name, fn) {
  * @alias hasHooks
  */
 Hooks.hasHook = function(hookType) {
-  return !!this.options.hooks[hookType].length;
+  return this.options.hooks[hookType] && !!this.options.hooks[hookType].length;
 };
 Hooks.hasHooks = Hooks.hasHook;