Beryllium: Null is a legal revId in createC4DocumentChange
Description
The current implementation of createC4DocumentChange returns null if called with a null revId. Null is legal and should cause the associated doc to be reported as changed, to the user.
The current implementation of createC4DocumentChange returns null if called with a null revId. Null is legal and should cause the associated doc to be reported as changed, to the user.