James Treanor 2b7d7999e1 Fix nullability warnings in RCTExceptionsManager (#24467)
Summary:
There are a number of nullability warnings in `RCTExceptionsManager` when building React Native for iOS with Xcode 10.2. This resolves them without changing the existing behavior.

See the warnings here:

![image](https://user-images.githubusercontent.com/1773641/56201323-89551380-6038-11e9-9998-b6a8d3d28f36.png)

[iOS] [Fixed] - Fix nullability warnings in RCTExceptionsManager
Pull Request resolved: https://github.com/facebook/react-native/pull/24467

Differential Revision: D14973485

Pulled By: cpojer

fbshipit-source-id: 2fac9f067ac9418397c3913760a2403f9a2cc147
2019-04-30 22:25:24 +02:00
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