From 186e66ca75f3cd1d602581adc3f0d1bf301d1949 Mon Sep 17 00:00:00 2001
From: TooBug <i@toobug.net>
Date: Sat, 22 Nov 2014 13:14:37 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A4=84=E7=90=86=E6=8F=92=E5=85=A5=E4=BB=A3?=
 =?UTF-8?q?=E7=A0=81=E6=97=B6=E5=87=BA=E7=8E=B0undefined=E7=9A=84=E6=83=85?=
 =?UTF-8?q?=E5=86=B5?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

双击某个地方选中一个单词，点击code，会出现undefined字样。不确定是否是意料中的行为，或者也有可能是前面没处理好导致undefined出现
---
 src/pen.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pen.js b/src/pen.js
index dd4735d..1c8d621 100644
--- a/src/pen.js
+++ b/src/pen.js
@@ -135,7 +135,7 @@
   }
 
   function commandWrap(ctx, tag, value) {
-    value = '<' + tag + '>' + value + '</' + tag + '>';
+    value = '<' + tag + '>' + (value||'') + '</' + tag + '>';
     return commandOverall(ctx, 'insertHTML', value);
   }