qa: prevent nslookup in qa/507 from causing a hang
qa: prevent nslookup in qa/507 from causing a hang

If nslookup is passed no hostname (due to earlier grep
filtering a 'short' hostname out), we do not want the
test to block waiting on user input.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp