Fix a bug with tac_lite plus a empty variable

I got some errors on crss/nodetype/[type] when using tac_lite http://drupal.org/project/tac_lite. Here are the changes that fixed it for me.

I changed this:

db_rewrite_sql("SELECT nid FROM {node} ...

to this:

db_rewrite_sql("SELECT n.nid FROM {node} n ...

The variabel typename was never set so I added:

$typename = node_get_name($type);