From f5de5297f740be498ea59c57819fb4b4a4acba3a Mon Sep 17 00:00:00 2001
From: Timothy Soehnlin <timothy.soehnlin@gmail.com>
Date: Tue, 27 Dec 2016 12:22:41 -0500
Subject: [PATCH] Allowing callback to be optional

This allows callback to be optional as `$__validate` assumes callback is defined and not optional.
---
 lib/document.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/document.js b/lib/document.js
index bb433f01a5b..08719092a8f 100644
--- a/lib/document.js
+++ b/lib/document.js
@@ -1232,7 +1232,7 @@ Document.prototype.validate = function(options, callback) {
     options = null;
   }
 
-  this.$__validate(callback);
+  this.$__validate(callback || function() {});
 };
 
 /*!