Prevent exceptions reported by Sentry

[Apollon77]

• only close Serialport if also open to prevent exception (https://sentry.iobroker.net/share/issue/c6f155165ff44551bda467e8ebc81d86/)
  • catch and re-emit error events for serialport and tcp to allow users of this library to react on errors and not end in an uncatchable exception (https://sentry.iobroker.net/share/issue/f7bfb42f5ebf414d85b5b5d56a530595/)
  • prepare changes as 0.14.1

Sorry for the mixup ... something went wrong while rebasing :-(

[Apollon77]

Danke!