Avoid serializing UndefinedColor when rendering texts
Avoid serializing UndefinedColor when rendering texts

Summary: This diff avoids the serialization of color that are set as: "UndefinedColor". This allows the text rendering system to set the default color in the native side

Reviewed By: shergin

Differential Revision: D10275834

fbshipit-source-id: b81c7a5995bef65e04a246d99f44ff10cb20f548

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