Feature: [Network] Ensure players fill in a name instead of defaulting to "Player"

src/network/network.cpp

@@ -692,6 +692,8 @@ void NetworkClientConnectGame(NetworkAddress address, CompanyID join_as, const c
 
 	if (address.GetPort() == 0) return;
 
+	if (!NetworkValidateClientName()) return;
+
 	strecpy(_settings_client.network.last_host, address.GetHostname(), lastof(_settings_client.network.last_host));
 	_settings_client.network.last_port = address.GetPort();
 	_network_join_as = join_as;