Merge remote-tracking branch 'origin/QA_4_2' into QA_4_2

ChangeLog

@@ -3,6 +3,7 @@ phpMyAdmin - ChangeLog
 
 4.2.8.0 (not yet released)
 - bug #4516 Odd export behavior
+- bug #4519 Uncaught TypeError: Cannot read property 'success' of null
 
 4.2.7.1 (2014-08-17)
 - bug #4501 [security] XSS in table browse page

js/ajax.js

@@ -234,6 +234,9 @@ var AJAX = {
      * @return void
      */
     responseHandler: function (data) {
+        if (typeof data === 'undefined') {
+            return;
+        }
         if (data.success) {
             $table_clone = false;
             PMA_ajaxRemoveMessage(AJAX.$msgbox);