Fix a crash that would occur when adding an invalid Instant JSON payload

[radazzouz]

Fix #278

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Details

The crashed occurred because we were adding a null annotation to the annotations array. We now fail gracefully and we pass the error over the bridge.

Acceptance Criteria

• Fix the crash.
• When approved, right before merging, rebase with master and increment the package version in package.json, package-lock.json, and samples/Catalog/package.json (see example commit: 1bf805f).
• Create a new release (and tag) with the new package version (see https://github.com/PSPDFKit/react-native/releases).

[steviki]

This makes sense! 🙂