Matt thanks for the suggestion. I checked my video files also (changed the smartlist to check video files and still comes up blank. The problem also couldn't only be video files as I was about to update my posting with the following information to give more info. Total files 7180, audio 7166, video 7, image files 7. Thumbnails built 7180 of 7180, Audio Analyzed 7160 of 7173. So there are 13 files that are apparently not analyzed. I see that the 7173 is the sum of my audio and video fiiles (7166+7).
I also listed all my audio and video files and confirmed that each has a value in the dynamic range field, which from what I can see usually only gets populated when I have run the library tool analyze audio.