added a missing comma in the Department model admin list filter function

widget_aguandhischipmunks/dashboard/admin.py

@@ -7,7 +7,7 @@ class DepartmentAdmin(admin.ModelAdmin):
     model = Department
     search_fields = ("dept_name", "home_unit",)
     list_display = ("dept_name", "home_unit",)
-    list_filter = ("dept_name")
+    list_filter = ("dept_name",)
 
 
 # admin panel for WidgetUser model