Hi,
I hope you have 0EMPLOYEE Infoobject in your learning solutions cube.
You can give a try to this approach.
Create a Query..Drag and drop 0EMPLOYEE into rows--click on it--on right hand side panel--Hit the Advanced tab--Access type for result values--Choose Master data.
This should show the list of all the employees irrespective if the transaction data for them available in cube or not.
Regards,
AL