class Middleman::PreviewServer::Checks::RequiresBindAddressIfServerNameIsGiven

If the ‘bind_address` is blank this check will fail
This one requires a bind address if the user entered a server name

def validate(information) 

def validate(information)
  return unless information.bind_address.blank?
  information.valid = false
  information.reason = format('Server name "%s" does not resolve to an ip address', information.server_name)
end