delete & unlock on previously locked resources

Hi Guys,

Litmus 0.12 added tests for locking unmapped urls. One of the tests is  
failing for me, and I have a feeling it might be a bug in litmus, so I  
wanted to ask here..

test 38: unmapped_lock
* LOCK /litmus/unmapped_url (i respond with 201 Created)
* DELETE /litmus/unmapped_url (i respond with 204 No Content)

test 39: unlock
* UNLOCK /litmus/unmapped_url

I fail the last unlock with 412 Precondition failed

Would 412 be the correct response in this case?

Thanks!
Evert