Throw error when setting value of AnimatedValue to undefined
Throw error when setting value of AnimatedValue to undefined

Summary:
Changelog: [Internal] Throw error when setting Animated value to undefined.

Background:
ReadableNativeMap removes keys that have undefined values. Somewhere some animation is setting the value to be undefined.

Follow up: Find a way to warn generally that undefined values are being set for maps that become ReadableNativeMaps

Reviewed By: JoshuaGross

Differential Revision: D20169325

fbshipit-source-id: 404b727dc238703ebe5f71a0939340d5f1b3b211

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