Summary: `exportStore` throws, when no device is connected. The error wasn't catched and `process.exit();` never called. The result is that the CLI couldn't be interrupted as long as `exportStore` thorws (e.g. no device connected). Catching this error now. Reviewed By: passy Differential Revision: D14520754 fbshipit-source-id: 97b245c4de53e58bac8066a1b15874d873bf2841