As said before, this can be avoided by script, but then no tag will be written.
I tried to experiment with such a file, but failed to create a test file. My second tagging tool (Puddletag) doesn’t write empty tags either.
Do you actually need a tag with an empty value?
PhYrE
22
Options | Scripting | Add new tagger script
Include the following and ensure it is checked (so it auto applies):
$if($lte(%totaldiscs%,1),$delete(discnumber))
$if($lte(%totaldiscs%,1),$unset(totaldiscs))
This will have disc number for a multi-disc album but no disc number otherwise.
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