The EXCEPTION didn't work correctly

Question

I made that code :-
CREATE OR REPLACE FUNCTION qq (v_id NUMBER)
RETURN NUMBER
IS
sal NUMBER;
BEGIN
SELECT salary
INTO sal
FROM employees
WHERE employee_id = v_id;
RETURN sal;
EXCEPTION
WHEN OTHERS
THEN
DBMS_OUTPUT.put_line ('NO such ID for any Employee in this company ');
END;
and when I executed it like that :-
SQL> BEGIN
2 DBMS_OUTPUT.put_line (qq (942));
3 END;
4 /
NO such ID for any Employee in this company
BEGIN
ERROR at line 1:
ORA-06503: PL/SQL: Function returned without value
ORA-06512: at "HR.QQ", line 10
ORA-06512: at line 2
SQL> ed
Wrote file afiedt.buf
1 BEGIN
2 DBMS_OUTPUT.put_line (qq (142));
3* END;
SQL> /
3100
PL/SQL procedure successfully completed.
why the exception line :-
NO such ID for any Employee in this company
come with the error below :-
BEGIN
ERROR at line 1:
ORA-06503: PL/SQL: Function returned without value
ORA-06512: at "HR.QQ", line 10
ORA-06512: at line 2
I want the exception Line - that I wrote - only appear without oracle errors ........ how can I do that ?

Answer 1

Put a RETURN statement inside you exception handler or raise an error.
You can do:
raise_application_error (-20012, 'NO such ID '||to_char(v_id)||' for any Employee in this company ');