In a previous thread, I learned how to configure an action item to change a Vorbis Comment field name from, say, ORGANIZATION to PUBLISHER, associating the original tag's value with the new field name. The action item looks like this:
Format value "PUBLISHER":%organization%"
Remove fields "ORGANIZATION"
This works well but only if you run the action item once. Otherwise, it has a serious drawback. If one accidentally runs the action item twice on the same file (quite possible if you're processing a large number of albums at once), this action will remove the PUBLISHER tag and of course it's value, as the undesired tag ORGANIZATION no longer exists. The resulting impact of the loss of information should be obvious.
Is there a conditional means to prevent this action item from running IF the ORGANIZATION tag is not present in the first place?