Summary:
Changelog: [internal]
shergin found that folly's merge_patch implementation doesn't propagate `null` correctly (details in D26435620 (https://github.com/facebook/react-native/commit/1e9f63fe277c42d812ef007ced7eff1688602b62)). This is a requirement and needs to be adjusted in props forwarding on Android.
As far as we know this isn't causing any bugs but it is an error that should be fixed.
Reviewed By: shergin
Differential Revision: D26545821
fbshipit-source-id: 9edd24aecfcde17f5d9c1197f65db0e0f3f9e364