Abby dies, and her good friend, claire is appointed to administer abby's estate. abby's house was in poor condition, so claire orally hired a contractor to make repairs. claire also orally promised that if the estate could not pay the repair bill, he would pay it even though he does not live in the house and has no entitlement under abby's estate. the estate does not pay the repair bill. who can the contractor collect from, if anyone?