Fix notifications endpoint

lib/ClientBase.js

@@ -9,6 +9,7 @@ var request       = require('request'),
     Checkout      = require('./model/Checkout'),
     Deposit       = require('./model/Deposit'),
     Merchant      = require('./model/Merchant'),
+    Notification  = require('./model/Notification'),
     Order         = require('./model/Order'),
     PaymentMethod = require('./model/PaymentMethod'),
     Sell          = require('./model/Sell'),
@@ -31,6 +32,7 @@ var MODELS = {
   'checkout'       : Checkout,
   'deposit'        : Deposit,
   'merchant'       : Merchant,
+  'notification'   : Notification,
   'order'          : Order,
   'payment_method' : PaymentMethod,
   'sell'           : Sell,
@@ -245,10 +247,13 @@ ClientBase.prototype._getAllHttp = function(opts, callback, headers) {
 
   this._getHttp(path, args, function onGet(err, result) {
     if (!handleError(err, result, callback)) {
-      var ObjFunc = self._stringToClass(result.data[0].resource);
-      var objs = _.map(result.data, function onMap(obj) {
-        return new ObjFunc(self, obj);
-      });
+      var objs = [];
+      if (result.data.length !== 0) {
+        var ObjFunc = self._stringToClass(result.data[0].resource);
+        objs = _.map(result.data, function onMap(obj) {
+          return new ObjFunc(self, obj);
+        });
+      }
       callback(null, objs, result.pagination);
     }
   }, headers);