From 6a1844cac70337f4705a707ce5a8e4edc73c2b88 Mon Sep 17 00:00:00 2001
From: ansuz <ansuz@transitiontech.ca>
Date: Wed, 8 Jul 2020 13:37:21 -0400
Subject: [PATCH] avoid passing whitespace to markmap or mathjax

---
 www/common/diffMarked.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/www/common/diffMarked.js b/www/common/diffMarked.js
index efe22285a..1433a2381 100644
--- a/www/common/diffMarked.js
+++ b/www/common/diffMarked.js
@@ -191,6 +191,7 @@ define([
     var defaultCode = renderer.code;
 
     renderer.code = function (code, language) {
+        if (!code || typeof(code) !== 'string' || !code.trim()) { return defaultCode.apply(renderer, arguments); }
         if (language === 'mermaid' && code.match(/^(graph|pie|gantt|sequenceDiagram|classDiagram|gitGraph)/)) {
             return '<pre class="mermaid" data-plugin="mermaid">'+Util.fixHTML(code)+'</pre>';
         } else if (language === 'markmap') {