From 61b57e0b76ceca947d79586d899f170c769a7dc8 Mon Sep 17 00:00:00 2001
From: Alban Coquoin <acoquoin@gmail.com>
Date: Tue, 31 Mar 2015 10:39:55 +0200
Subject: [PATCH] Fix "ypeError: Cannot call method 'walk' of undefined"

problem with the uglify assetic filter who add option "no-mangle"
---
 bin/uglifyjs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bin/uglifyjs b/bin/uglifyjs
index 9b335b74..57370e6a 100755
--- a/bin/uglifyjs
+++ b/bin/uglifyjs
@@ -470,7 +470,7 @@ function normalize(o) {
 
 function getOptions(x, constants) {
     x = ARGS[x];
-    if (x == null) return null;
+    if (!x) return null;
     var ret = {};
     if (x !== "") {
         var ast;