node_type_delete() invokes hook on no data

Issue Summary

Here is what I experienced:

1. Called node_type_delete('my_content_type') from hook_uninstall()
2. node_type_delete() deleted from {node_type}
3. node_type_delete() called node_get_types(), which had not yet been initialized
4. node_type_delete() called module_invoke('node_type', 'delete', $info) with an empty variable
5. content_type_delete() failed

As-is, it works when deleting content types from the administrative page. We didn't notice this problem until now because node_menu() calls node_get_types() for the administrative pages, which initializes a static variable before node_type_delete() deletes from {node_types}.

The attached patch swaps two lines, calling node_get_types() before deleting from {node_type} in every case.

I experienced this with Drupal 5.x, but I see the same thing in Drupal 6.x so I am marking this for 6.x-dev.