replace NULL with null

Another global search-and-replace update. Here, I've replaced the PHP
keyword 'NULL' with its lowercase version. This is another PEAR code
standards change.

darcs-hash:20081223192129-84dde-4a0182e0ec16a01ad88745ad3e08f7cb501aee0b.gz

scripts/enjitqueuehandler.php

@@ -117,7 +117,7 @@ class EnjitQueueHandler extends QueueHandler {
 
 mb_internal_encoding('UTF-8');
 
-$id = ($argc > 1) ? $argv[1] : NULL;
+$id = ($argc > 1) ? $argv[1] : null;
 
 $handler = new EnjitQueueHandler($id);