Yes, using a script you can do that.
Step 1. Limit the search to only folders
Set the file name expression type to be Folders Only.

Step 2. Pick the empty_folders.js
script
Go to the Scripting Tab and activate the File name script. Pick the empty_folders.js
script which is installed into the Sample Scripts folder, usually here:
C:\Program Files\Mythicsoft\FileLocator Pro\Sample Scripts\empty_folders.js
Click the Test button to make sure it works.

Step 3. Run the search
Now when you run the search you should find that only empty folders are found.