--- devel_generate.inc	2009-06-09 04:22:39.000000000 +0100
+++ devel_generate.inc.new	2009-11-09 14:42:36.000000000 +0000
@@ -218,7 +218,7 @@ function devel_generate_word($length){
 
 function devel_create_content($type = NULL) {
   $nparas = mt_rand(1,12);
-  $type = empty($type) ? mt_rand(0,3) : $type;
+  $type = is_null($type) ? mt_rand(0,3) : $type;
 
   $output = "";
   switch($type % 3) {