Avoid notices in some environments

include/init.php

@@ -276,9 +276,12 @@ if (function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc()) {
  * QUERY_STRING also needs the same treatment since it is
  * used in php_self().
  */
-$_SERVER['REQUEST_URI'] = htmlspecialchars($_SERVER['REQUEST_URI']);
-$_SERVER['PHP_SELF'] = htmlspecialchars($_SERVER['PHP_SELF']);
-$_SERVER['QUERY_STRING'] = htmlspecialchars($_SERVER['QUERY_STRING']);
+if (isset($_SERVER['REQUEST_URI']))
+    $_SERVER['REQUEST_URI'] = htmlspecialchars($_SERVER['REQUEST_URI']);
+if (isset($_SERVER['PHP_SELF']))
+    $_SERVER['PHP_SELF'] = htmlspecialchars($_SERVER['PHP_SELF']);
+if (isset($_SERVER['QUERY_STRING']))
+    $_SERVER['QUERY_STRING'] = htmlspecialchars($_SERVER['QUERY_STRING']);
 
 $PHP_SELF = php_self();