Summary:
when conditional rendering is used then picker breaks when the child is null in iOS
This conditional rendering inside Picker fails when "someBooleanValue" variable is false
```
{
this.state.someBooleanValue && <Picker.Item label="value" value="value" />
}
```
[iOS] [Fixed] - null check on children by using filter
Pull Request resolved: https://github.com/facebook/react-native/pull/24057
Differential Revision: D14538337
Pulled By: cpojer
fbshipit-source-id: d9324671931b5f1dac65d8058d9aa957b650af25
aa10b3f293