SQL & PL/SQL

Hello,
I'm using 6i and building a report to show employees who have incorrectly input their time. I have an input parameter so a user can select a specific employee by emp_id or can leave it empty to show all. That part works. I also have date parameters that are required. That works too. However I am having trouble displaying 'NO Records Found' if the date parameters have no late or rejected employee time records. I currently have it as a text field arranged behind the emp_name field which i filled white. It works...however i have a pretty good feeling there is a better way to do this. Also, I have some data that is null since i am using two tables. There are time stamps with no emp_name or emp_number. I still need to show these records but want them to show up as "Employee Name Unknown" that way the user doesnt get confused and thinks the emp_name in the row above also includes this row.

select e.location "Clock Location",
e.emp_no "Emp No",
l.first_name ||' ' || last_name "Name",
e.time_stamp "Time",
from emp_time e, master_all l
where e.emp_no (+) = l.emp_no
and e.status = 'rejected'
--and e.emp_no = nvl (:p_emp_no, emp_no)
--and e.time_stamp between :p_start_date and :p_end_date