From c648d1385c6287496c04f1116c7be39c19adc9da Mon Sep 17 00:00:00 2001
From: Alexander Ebert <ebert@woltlab.com>
Date: Wed, 12 Jun 2013 01:36:13 +0200
Subject: [PATCH] Discarding meaningless error messages for AJAX requests

Some requests do not return anything, which is perfectly fine but causes empty error messages to be displayed.
---
 wcfsetup/install/files/js/WCF.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/wcfsetup/install/files/js/WCF.js b/wcfsetup/install/files/js/WCF.js
index 25c912838e..99c5278017 100755
--- a/wcfsetup/install/files/js/WCF.js
+++ b/wcfsetup/install/files/js/WCF.js
@@ -1863,7 +1863,11 @@ WCF.Action.Proxy = Class.extend({
 			
 			if (!this._suppressErrors && $showError !== false) {
 				var $message = (textStatus === 'timeout') ? WCF.Language.get('wcf.global.error.timeout') : jqXHR.responseText;
-				$('<div class="ajaxDebugMessage"><p>' + $message + '</p></div>').wcfDialog({ title: WCF.Language.get('wcf.global.error.title') });
+				
+				// validate if $message is neither empty nor 'undefined'
+				if ($message && $message != 'undefined') {
+					$('<div class="ajaxDebugMessage"><p>' + $message + '</p></div>').wcfDialog({ title: WCF.Language.get('wcf.global.error.title') });
+				}
 			}
 		}
 		
-- 
2.20.1