Made sure that the various _SaverMutable objects evaluate to False when they are empty.
Made sure that the various _SaverMutable objects evaluate to False when they are empty.

feend78/evennia,feend78/evennia,titeuf87/evennia,titeuf87/evennia,jamesbeebop/evennia,jamesbeebop/evennia,feend78/evennia,feend78/evennia,titeuf87/evennia,jamesbeebop/evennia,titeuf87/evennia