correct equality check

lib/dao-factory.js

@@ -162,7 +162,7 @@ module.exports = (function() {
       }
 
       //add default attributes
-      if(typeof instance[name] == 'undefined') {
+      if(typeof instance[name] === 'undefined') {
         var value = null
 
         if(self.rawAttributes.hasOwnProperty(name) && self.rawAttributes[name].hasOwnProperty('defaultValue')) {
@@ -172,6 +172,7 @@ module.exports = (function() {
         instance[name] = value
         instance.addAttribute(name, value)
       }
+
       // add validation
       if (self.rawAttributes.hasOwnProperty(name) && self.rawAttributes[name].hasOwnProperty('validate')) {
         instance.setValidators(name, self.rawAttributes[name].validate)