As the title says, is there a way to filer photos in Lr based on if they were edited or not? ...without any ratings applied
Create a smart collection where the criterion is "Has Adjustments" = YES for photos that have been edited; or "Has Adjustments" = NO for photos that have not been edited.
You can also turn on the badges in the GRID view so that you can visually determine from the badge if the photo has been edited or not.
Retrieving data ...