From 96811a55e61ec9360782b24c9e630a61666618db Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <fox@madoka.volgo-balt.ru>
Date: Thu, 11 Nov 2010 09:52:19 +0300
Subject: [PATCH] sanitize_rss: properly handle empty input

---
 functions.php | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/functions.php b/functions.php
index cd6fafd11..d5852bde1 100644
--- a/functions.php
+++ b/functions.php
@@ -3707,10 +3707,10 @@
 
 	function sanitize_rss($link, $str, $force_strip_tags = false, $owner = false, $site_url = false) {
 
-		$res = $str;
-
 		if (!$owner) $owner = $_SESSION["uid"];
 
+		$res = trim($str); if (!$res) return '';
+
 		if (get_pref($link, "STRIP_UNSAFE_TAGS", $owner) || $force_strip_tags) {
 
 //			$res = strip_tags_long($res, 
@@ -3729,6 +3729,8 @@
 			<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
 		</head>';
 
+		$res = trim($res); if (!$res) return '';
+
 		libxml_use_internal_errors(true);
 
 		$doc = new DOMDocument();