Detecting invisible tiles

Maybe there is a way to do this, but I got a bunch of invisible/transparent tiles stamped into my map. Probably happened because I had a transparent tile selected and stamped around not releasing anything was being placed. The problem is these tiles are on my collision layer and creating problems.

It would be nice if there was a command to show/highlight empty vs filled tiles.

OK, I kind of figure out how to do this.

Select the tool Select Same Tile and click on a empty place, then invert the selection.