title: How to configure Fluent NHibernate to return null instead of proxies for missing objects when using ReferencesAny
body: <p>As per the title, I have an object which has a ReferencesAny association, but it's possible that the referenced object may have been deleted. If this has occurred, currently the missing object is initialized with a proxy which then throws ObjectNotFound if accessed. I want to be able to have this return null instead, in a similar fashion to setting not-found to "ignore" on other properties. I understand the differences between using Session.Get and Session.Load but this is occurring as a result of a LINQ query.</p>
  
  <p>So, my question is, how can I specify that null should be returned for missing objects for an "any" association? </p>