XML generating empty row

 Hello all,

When I run the SQL, it produces one row.

SELECT

  to_char(to_date(max(trx.trx_date), 'DD-MON-RRRR'), 'YYYY/MM/DD') ar_etd
     , fnd_date.canonical_to_date(wsh.attribute7) etd
    , fnd_date.canonical_to_date(wsh.attribute8) eta
    , wsh.attribute9 container
    , wsh.attribute2 vessel
     , oolv.attribute10 meat_number
     , oolv.header_id

  FROM oe_order_lines_v oolv
     , oe_ra_cust_trx_hdr_v trx
   , wsh_new_deliveries wsh
  , wsh_delivery_assignments wda
    , wsh_delivery_details wdd

WHERE oolv.order_number = trx.order_number (+)
AND oolv.line_number = (select min(line_number)
                       from oe_order_lines_v ov