iOS: Fix Crash when CameraRoll is getting assets from iCloud and no filename is provided. #13671
iOS: Fix Crash when CameraRoll is getting assets from iCloud and no filename is provided. #13671

Summary:
RCTCameraRollManager.m crashes when there is no filename provided for the asset (usually from iCloud). #13671

Tested on real device with iCloud library using the library without and after my fix. It worked after my changes.

[IOS] [BUGFIX] [CameraRoll] - Changed the filename if nil to be empty when the asset is coming from iCloud.
Closes https://github.com/facebook/react-native/pull/17549

Differential Revision: D6710665

Pulled By: hramos

fbshipit-source-id: 319865b0a71728798c62ee380e7bee4af584b3e3

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