From 132f6df6c8b2a0bcbb813be0889019de49a9bb55 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrg=20Lehni?= <juerg@scratchdisk.com>
Date: Sun, 5 Jan 2014 18:57:36 +0100
Subject: [PATCH] Prevent overriding of global variables with undefined values
 during development.

---
 src/core/PaperScope.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/PaperScope.js b/src/core/PaperScope.js
index ec0b2c14..f9f60e84 100644
--- a/src/core/PaperScope.js
+++ b/src/core/PaperScope.js
@@ -160,7 +160,7 @@ var PaperScope = Base.extend(/** @lends PaperScope# */{
 		// fields on PaperScope.prototype, e.g. all classes
 		for (var key in this)
 			// Exclude all 'hidden' fields
-			if (!/^_/.test(key))
+			if (!/^_/.test(key) && this[key])
 				scope[key] = this[key];
 	},