test(PropertySetter): Add unit test for null/undefined fallback behavior
test(PropertySetter): Add unit test for null/undefined fallback behavior

Ensure that when the props map has a JSON null or undefined value, that the default value is used.

lbochenek/react-native-windows,lbochenek/react-native-windows,lbochenek/react-native-windows,lbochenek/react-native-windows