fixed NOTICE

libraries/common.lib.php

@@ -454,6 +454,9 @@ function PMA_showHint($message, $bbcode = false, $type = 'notice')
     }
 
     if (! isset($GLOBALS['footnotes'][$key])) {
+        if (empty($GLOBALS['footnotes']) || ! is_array($GLOBALS['footnotes'])) {
+            $GLOBALS['footnotes'] = array();
+        }
         $nr = count($GLOBALS['footnotes']) + 1;
         // this is the first instance of this message
         $instance = 1;