Return Null Values

Summary

Return results in a report where a field has null or no value

Content

I am working on a report that is pulling from the salary and compensation details real time subject areas. Two of the fields that i am using on the report are from the Department - Hierarchy folder (Level 2 name and Level 3 name). With these two fields on the report, if i run the report for a department that doesn't have a level 2 or level 3 value i get no results. If i remove the fields i get the expected results. What can i do to get results for null or empty fields on this report?