From f97d313c0f8b21279aa06e0cd1ee183687921df6 Mon Sep 17 00:00:00 2001
From: Alexander Ebert <ebert@woltlab.com>
Date: Mon, 11 Jul 2016 00:09:46 +0200
Subject: [PATCH] Ensure dom fragment is never empty in terms of child nodes

---
 .../html/input/node/HtmlInputNodeWoltlabMetacode.class.php   | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacode.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacode.class.php
index 8b8251d838..9311e2c91f 100644
--- a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacode.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacode.class.php
@@ -74,7 +74,10 @@ class HtmlInputNodeWoltlabMetacode extends AbstractHtmlInputNode {
 			
 			/** @var IMetacodeConverter $converter */
 			if ($converter->validateAttributes($attributes)) {
-				$newElement = $converter->convert(DOMUtil::childNodesToFragment($element), $attributes);
+				$fragment = DOMUtil::childNodesToFragment($element);
+				if (!$fragment->hasChildNodes()) $fragment->appendChild($fragment->ownerDocument->createTextNode(''));
+				
+				$newElement = $converter->convert($fragment, $attributes);
 				if (!($newElement instanceof \DOMElement)) {
 					throw new \UnexpectedValueException("Expected a valid DOMElement as return value.");
 				}
-- 
2.20.1