error when trying to download dhcp data when private IP address was not entered

When adding multiple computers, you end up with the option to download dhcpd.conf data. Entering private addresses is optional on the add multiple computers page. If the private addresses are not entered, you should not be prompted to download dhcpd.conf data because private ip info is needed.

None of this will matter if the ability to download dhcpd.conf data is separated out from adding computers.