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Summary: If user slide picker when picker item is zero, `UIPickerViewDelegate` will call `pickerView:didSelectRow:inComponent` row=0, `_items[row][@"value"]` will crash. Closes https://github.com/facebook/react-native/pull/12187 Differential Revision: D4709882 Pulled By: mkonicek fbshipit-source-id: 772c819d4eaef41ac983287877bda2918f40b1a7