Prevent possible crash due to null RemoteConfig. #6005
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In our logic that returns the current remote configuration, it deserializes the current configuration from Prefs, but this deserialization could potentially fail (return
null), particularly if the remote config structure has changed recently.This could cause a crash because we're currently using an explicit nonnull operator when returning the config, so let's fall back to a default config instance.
(This also updates the Year-in-Review config structure to the latest.)