Remove null file reference in Xcode project (#23883)
Remove null file reference in Xcode project (#23883)

Summary:
So strange we have some null reference in Xcode, let's remove them.
CC. cpojer .

[iOS] [Fixed] - Remove null file reference in Xcode project
Pull Request resolved: https://github.com/facebook/react-native/pull/23883

Differential Revision: D14436828

Pulled By: cpojer

fbshipit-source-id: da6eb3b6a0941a9f91991403d1eef53da94a543a

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