From f5fff5097cc835d5e1d5493572d5dc67d273cf04 Mon Sep 17 00:00:00 2001
From: Camille Reynders <camille.reynders@gmail.com>
Date: Thu, 31 Mar 2016 14:12:14 +0200
Subject: [PATCH] Make model parameter optional for Backbone.sync

---
 backbone.js  | 4 +++-
 test/sync.js | 6 ++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/backbone.js b/backbone.js
index 2ca5cd53b..ff93bc40d 100644
--- a/backbone.js
+++ b/backbone.js
@@ -1441,7 +1441,9 @@
 
     // Make the request, allowing the user to override any Ajax options.
     var xhr = options.xhr = Backbone.ajax(_.extend(params, options));
-    model.trigger('request', model, xhr, options);
+    if (model){
+      model.trigger('request', model, xhr, options);
+    }
     return xhr;
   };
 
diff --git a/test/sync.js b/test/sync.js
index 8813f1584..931d56d4d 100644
--- a/test/sync.js
+++ b/test/sync.js
@@ -236,4 +236,10 @@
     this.ajaxSettings.error({}, 'textStatus', 'errorThrown');
   });
 
+  QUnit.test('`model` is optional', function(assert) {
+    assert.expect(0);
+    Backbone.sync('read', null, {
+      url: '/library'
+    });
+  });
 })();