Realname creates a NULL property on the user object

We're working on cacheing user objects, and are trying to iron out inconsistencies between the objects when user_load is called in different contexts.

Sometimes Realname adds a NULL homepage property to our user objects, which is unwanted. Patch to follow, maybe more as our testing continues.

It may be a stretch to call this a bug of course, but so far Realname is the only module out of hundreds that is creating inconsistenties for us.