From cc3d44aec1ff4f1bc2db197a039f9f25f01acd40 Mon Sep 17 00:00:00 2001
From: Jermolene <jeremy@osmosoft.com>
Date: Tue, 6 May 2014 17:32:12 +0100
Subject: [PATCH] Fix problem with list fields containing `[[]]`
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Fixes #603 - thanks @xcazin!

It no longer crashes but unfortunately if you round trip a tiddler out
of edit mode and back you’ll lose any empty double square brackets.
---
 boot/boot.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/boot/boot.js b/boot/boot.js
index c08acdcac..1d098429d 100644
--- a/boot/boot.js
+++ b/boot/boot.js
@@ -273,7 +273,7 @@ $tw.utils.parseStringArray = function(value) {
 			match = memberRegExp.exec(value);
 			if(match) {
 				var item = match[1] || match[2];
-				if(results.indexOf(item) === -1) {
+				if(item !== undefined && results.indexOf(item) === -1) {
 					results.push(item);
 				}
 			}