Improve error message if aSmSChannel doesn't have a Recipient. ATM The snippet bellow output the message:
The "sms" channel is not supported. because theSmsChannel::supports returnfalse if you pass an instance ofNoRecipient.

This PR improve the error message with : "The "sms" channel needs a Recipient."

<?php$notifier =newNotifier(['sms' =>newSmsChannel(newNullTransport())]);$notifier->send(newNotification("Hello World!", ["sms/twilio"]));