DELETE statement which does affect 0 rows

Hi,
when I run a DELETE statement which does not affect any row (0 rows have been deleted) and do no commit afterwards, I can see a row exclusive lock on the concerned table when runing the statement

SELECT OWNER || '.' || OBJECT_NAME "Object"
       ,OS_USER_NAME "Terminal"
       ,ORACLE_USERNAME "Locker"
       ,PROGRAM "Program"
       ,NVL(LOCKWAIT, 'ACTIVE') "Wait"
       ,DECODE(LOCKED_MODE, 2, 'ROW SHARE', 3, 'ROW EXCLUSIVE', 4, 'SHARE', 5, 'SHARE ROW EXCLUSIVE', 6, 'EXCLUSIVE', 'UNKNOWN') "Lockmode"
       ,OBJECT_TYPE "Object Type"
       ,SESSION_ID "Session ID"
       ,SERIAL# "Serial"
       ,C.SID "SID"
  FROM SYS.V_$LOCKED_OBJECT A
      ,SYS.ALL_OBJECTS B
      ,SYS.V_$SESSION C
 WHERE A.OBJECT_ID = B.OBJECT_ID