From addef09d1ccdded351fb908446e78ecf2a516e0c Mon Sep 17 00:00:00 2001
From: Jeremy Ruston <jeremy@osmosoft.com>
Date: Sun, 18 Nov 2012 14:56:33 +0000
Subject: [PATCH] Fix problem with JS parser crashing on skinny tiddlers

---
 core/modules/parsers/javascriptparser/javascriptparser.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/core/modules/parsers/javascriptparser/javascriptparser.js b/core/modules/parsers/javascriptparser/javascriptparser.js
index 89724711e..f1c8d63c5 100644
--- a/core/modules/parsers/javascriptparser/javascriptparser.js
+++ b/core/modules/parsers/javascriptparser/javascriptparser.js
@@ -22,6 +22,13 @@ var JavaScriptParser = function(options) {
 // Parse a string of JavaScript code and return the parse tree as a wikitext parse tree
 JavaScriptParser.prototype.parse = function(type,code) {
     // Try to parse the code
+    if(!code) {
+        return new $tw.Renderer([
+            $tw.Tree.Element("pre",{"class": "javascript-source"},[
+                $tw.Tree.Text("")
+            ])
+        ],new $tw.Dependencies(),this.wiki);
+    }
     var parseTree;
     try {
         parseTree = esprima.parse(code,{comment: true,tokens: true,range: true});