Do not log warning if JS responder isn't set in Fabric
Do not log warning if JS responder isn't set in Fabric

Summary:
Changelog: [Internal]

Do not log warning for "Invalid view set to be the JS responder".
{F242140509}

Fabric doesn't store views in view registry, therefore this warning would be shown to the developer everytime `[RCTUIManager setJSResponder]` is called.

Reviewed By: shergin

Differential Revision: D22309447

fbshipit-source-id: cac8985cdc79ab2d03a246cc2d9377472a64a683

hoangpham95/react-native,janicduplessis/react-native,hoangpham95/react-native,javache/react-native,facebook/react-native,pandiaraj44/react-native,pandiaraj44/react-native,janicduplessis/react-native,janicduplessis/react-native,myntra/react-native,myntra/react-native,pandiaraj44/react-native,myntra/react-native,arthuralee/react-native,janicduplessis/react-native,myntra/react-native,facebook/react-native,janicduplessis/react-native,javache/react-native,janicduplessis/react-native,myntra/react-native,hoangpham95/react-native,pandiaraj44/react-native,pandiaraj44/react-native,hoangpham95/react-native,hoangpham95/react-native,myntra/react-native,facebook/react-native,arthuralee/react-native,janicduplessis/react-native,javache/react-native,myntra/react-native,javache/react-native,pandiaraj44/react-native,hoangpham95/react-native,janicduplessis/react-native,hoangpham95/react-native,pandiaraj44/react-native,facebook/react-native,facebook/react-native,myntra/react-native,arthuralee/react-native,facebook/react-native,hoangpham95/react-native,javache/react-native,arthuralee/react-native,pandiaraj44/react-native,facebook/react-native,myntra/react-native,arthuralee/react-native,javache/react-native,facebook/react-native,javache/react-native,javache/react-native,javache/react-native,facebook/react-native