[core][port] Rename hasConnection() in isVoid()
[core][port] Rename hasConnection() in isVoid()

magyarm/periphondemand-code,trabucayre/periphondemand,Martoni/periphondemand,magyarm/periphondemand-code,trabucayre/periphondemand,Martoni/periphondemand,magyarm/periphondemand-code,trabucayre/periphondemand,Martoni/periphondemand,magyarm/periphondemand-code