Summary:
When an image source is parsed via `RCTImageFromLocalAssetURL` there seem to be certain situations in which `imageName` is empty from `RCTBundlePathForURL`. Any call to `UIImage imageNamed` with a an empty parameter will throw an exception:
```
CUICatalog: Invalid asset name supplied: '(null)'
```
In my case, the asset URL was pointing to an image in the application sandbox rather than the `NSBundle`. In this case `UIImage imageNamed` was throwing before the call to `NSData dataWithContentsOfURL` below could correctly resolve the image.
This change simply skips the call to `UIImage imageNamed` if no `imageName` value is set.
Pull Request resolved: https://github.com/facebook/react-native/pull/20120
Differential Revision: D14163101
Pulled By: cpojer
fbshipit-source-id: ceec95c02bf21b739962ef5618947a5726ba0473
bca85101cd