From 51dffcda867a493dbe3e97c3b0791ec9583afa04 Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <alec@alec.pl>
Date: Sun, 26 Mar 2017 19:17:38 +0200
Subject: [PATCH] Skip <script> element if it has no content

---
 program/include/rcmail_output_html.php | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/program/include/rcmail_output_html.php b/program/include/rcmail_output_html.php
index 777362c5d..3275eddb9 100644
--- a/program/include/rcmail_output_html.php
+++ b/program/include/rcmail_output_html.php
@@ -529,7 +529,9 @@ EOF;
         }
 
         // write all javascript commands
-        $this->add_script($commands, 'head_top');
+        if (!empty($commands)) {
+            $this->add_script($commands, 'head_top');
+        }
 
         // allow (legal) iframe content to be loaded
         $iframe = $this->framed || $this->env['framed'];
@@ -1542,7 +1544,7 @@ EOF;
      * @param string $script   JS code snippet
      * @param string $position Target position [head|head_top|foot]
      */
-    public function add_script($script, $position='head')
+    public function add_script($script, $position = 'head')
     {
         if (!isset($this->scripts[$position])) {
             $this->scripts[$position] = "\n" . rtrim($script);