solved setValue for nil using Optional.None
solved setValue for nil using Optional.None

alecthomas/EVReflection,jtianling/EVReflection,joncottonskyuk/EVReflection,jtianling/EVReflection,joncottonskyuk/EVReflection,christophercotton/EVReflection,alecthomas/EVReflection,zhouguangjie/EVReflection,christophercotton/EVReflection,zhouguangjie/EVReflection