[% USE CSV -%]
[% CSV.dump([ 'Left Device' 'Port' 'Duplex' 'Right Device' 'Port' 'Duplex' ]) %]

[% FOREACH row IN results %]
  [% mylist = [] %]
  [% device_left = row.left_dns || row.left_ip %]
  [% device_right = row.right_dns || row.right_ip %]
  [% FOREACH col IN [ device_left row.left_port row.left_duplex.ucfirst device_right row.right_port row.right_duplex.ucfirst ] %]
    [% mylist.push(col) %]
  [% END %]
  [% CSV.dump(mylist) %]

[% END %]