For the moment, I would recommend that you print pages with the word “Separator” (or something equivalent) placed on them to use as an identification condition, as currently we do not offer a blank page identification task in Quick Fields.

That being said, we’ve certainly heard this request before and I talked to development about this for you. They helpfully offered to put a “File Size” token into the upcoming 9.0 release of Quick Fields, which will allow you to trigger an identification condition if an image’s file size is less than a certain value (effectively allowing you to have an identification condition for when a blank page is scanned).