An empty mp3 dummy file can be created using a Mp3tag export script.
The name of the export script is freely selectable, e.g. "Create dummy mp3"
Just enter a line (specify the desired path):
$filename(Dummy.mp3)
Run the export script and the dummy file will be created.
You can try, if this will work ...
$filename(%_folderpath%\Artwork\Dummy.mp3)
Another proposal:
Do create a Mp3tag export script, which creates one CMD text file, ...
which in turn creates one dummy.mp3 file in each Artwork folder.
Within the CMD file do create a dummy.mp3 file:
ECHO.x>"%_folderpath%\Artwork\dummy.mp3"
See also ...
Cover mit verschieben
/t/12340/1
Empty folder
DD.20170425.1025.CEST