Remove rows of unnecessary submissions.

[John C]

When students attach documents to a Google Classroom assignment that adds a document to the Assignment Folder. Even if they delete it from their submission that document seems to remain. When ingesting assignments Doctopus pulls all of these documents (even if they were immediately deleted and blank) and adds them to the sheet. This adds a lot of clutter. Could there be an option to remove those documents that weren't actually submitted but exist in that folder?