Fix an error when TLD server successfully responses but subrequest to Referral Server or Registrar Whois causes an error

[kolonist]

This fixes an error when TLD nic server successfully responses but some of subrequests to Referral Server or Registrar Whois causes an error. Before it caused error without any data returned but this patch makes whois return at least TLD server answer.

You can test this issue with site.af. TLD server returns an answer but subrequest to Registrar Whois causes timeout error. Now library gives error, but with this patch it will give result.