removed obsolete null emitter

lib/dao-factory.js

@@ -103,8 +103,9 @@ module.exports = (function() {
 
   DAOFactory.prototype.find = function(options) {
     if([null, undefined].indexOf(options) > -1) {
-      var NullEmitter = require("./emitters/null-emitter")
-      return new NullEmitter()
+      return new Utils.CustomEventEmitter(function(emitter) {
+        setTimeout(function() { emitter.emit('success', null) }, 10)
+      }).run()
     }
 
     // options is not a hash but an id

lib/emitters/null-emitter.js

-var Utils = require("../utils")
-
-module.exports = (function(){
-  var NullEmitter = function(delay) {
-    var self = this
-
-    delay = delay || 10
-    setTimeout(function() { self.emitNull() }, delay)
-  }
-  Utils.addEventEmitter(NullEmitter)
-
-  NullEmitter.prototype.emitNull = function() {
-    this.emit('success', null)
-    this.emit('error', null)
-  }
-
-  return NullEmitter
-})()