reporting using pl/sql package - add line if no employees to report

I have a package that I have written in pl/sql that runs from a concurrent request in Oracle.  It reports average hours employees work within 26 pay periods.  It reports the store, employee name, and the hours.  I want to report only those employees who have anniversaries within a specific time period.  Some stores may not have employees to report and if so, I want to output a message for those that says, no employees to report.  But not sure how to do it.

Anyone have any ideas?