Fix incorrect warning on NativeEventEmitter when nativeModule is null
Fix incorrect warning on NativeEventEmitter when nativeModule is null

Summary: Changelog: [Internal]

Reviewed By: ShikaSD

Differential Revision: D27881851

fbshipit-source-id: 3b1cba618a86aff1e1c7ffbc0ea5d7047713d30a

janicduplessis/react-native,javache/react-native,pandiaraj44/react-native,arthuralee/react-native,arthuralee/react-native,facebook/react-native,arthuralee/react-native,facebook/react-native,myntra/react-native,pandiaraj44/react-native,pandiaraj44/react-native,myntra/react-native,facebook/react-native,javache/react-native,javache/react-native,pandiaraj44/react-native,janicduplessis/react-native,janicduplessis/react-native,facebook/react-native,myntra/react-native,arthuralee/react-native,myntra/react-native,arthuralee/react-native,javache/react-native,facebook/react-native,myntra/react-native,pandiaraj44/react-native,myntra/react-native,pandiaraj44/react-native,facebook/react-native,myntra/react-native,javache/react-native,janicduplessis/react-native,myntra/react-native,javache/react-native,janicduplessis/react-native,javache/react-native,pandiaraj44/react-native,pandiaraj44/react-native,facebook/react-native,facebook/react-native,myntra/react-native,janicduplessis/react-native,javache/react-native,janicduplessis/react-native,facebook/react-native,janicduplessis/react-native,javache/react-native