Allow DynamicProperty to be initialized with an optional object
Allow DynamicProperty to be initialized with an optional object

This regression was introduced in
0059830a20e29956f0d6d5dc1a7d08920e1b8b6e.

andersio/ReactiveCocoa,victorlin/ReactiveCocoa,sandyway/ReactiveCocoa,walkingsmarts/ReactiveCocoa,calebd/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,walkingsmarts/ReactiveCocoa,victorlin/ReactiveCocoa,calebd/ReactiveCocoa,sandyway/ReactiveCocoa,victorlin/ReactiveCocoa,walkingsmarts/ReactiveCocoa,sandyway/ReactiveCocoa,ikesyo/ReactiveCocoa,ohwutup/ReactiveCocoa,ohwutup/ReactiveCocoa,ohwutup/ReactiveCocoa,calebd/ReactiveCocoa,ikesyo/ReactiveCocoa,andersio/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,ReactiveCocoa/ReactiveSwift,andersio/ReactiveCocoa