EMS Remove pending update WS answer

Hello,
I'm in the last step of burning a license on a key (see my previous post here).

During test phase sometimes it happened I reused the same key, so I needed to remove the pending updates on that key before burning a new license. I am using the Remove All Pending Updates web service call; it works but when key is found and updates are deleted, the answer from web service is an HTTP 204 without Location header set, so I'm confused about how to check if remove was succesfull.

Thanks in advance an regards,
Stefano