authlogic and updateing a user without changing password


I created a new Rails app with authlogic to handle authentication and
what have you. In my admin section I'd like to change only the state of
users. The problem is that when I submit the form, I get the following
error: Password can't be blank

How to tell authlogic to not care about this error? Is it possible to
provide te à-la restful_auth option :allow_blank => true ?