Behaviour on faulty agent determination...

[Michael Klika]

Hi There
 
I'm wondering about the following: If I provide a non existing user id as an agent for a dialog task, than the list of users at the respective workitem at runtime is simply empty. 
 
Yes, of course I know that I have to check validity and existence of users! But, just for curiosity, please tell me: Why doesn't the system produce an error? 
 
I wouldn't go so far to give out a piece of chocolate, but I would be greatful for an answer :-))
 
Thanks, Michael