pyexiftool behaves differently than the command-line tool

[RawOnion69]

We have a requirement to clear the value of the XMP-dc:Creator field in a JPG image file, but keep the field itself intact.
In the Windows command-line tool this is done by:

exiftool "-XMP-dc:Creator= " example.jpg

However when this is done using the pyexiftool module, the whole tag gets deleted:

from exiftool import ExifTool
with ExifTool() as et:
et.execute("-XMP-dc:Creator= ", "example.jpg")

Is there a way to clear the value of a tag using the Python module whilst keeping the tag in question intact?

Cheers,
Martijn