Fix crash when localPort or connectedPort is nil (new)

[jsheffers]

Implemented fix recommended here by @Rapsssito

[Rapsssito]

Hi @jsheffers,

Thanks for the PR. However, this would mean something has gone terribly wrong. Since the onConnect callback should not be called with those properties being nil. This would just hang the JS forever waiting for a callback that won't be called.

See https://github.com/Rapsssito/react-native-tcp-socket/pull/172/changes#r2057757792

The correct approach is to find out why those properties are nil when the callback is called.