Skip waveform generation if no audio track
Skip waveform generation if no audio track

Co-authored-by: cjcolvar <65e351486203e5defaa152156f90f446fafc4de9@indiana.edu>

uvalib/avalon,nulib/avalon,uvalib/avalon,avalonmediasystem/avalon,uvalib/avalon,nulib/avalon,nulib/avalon,avalonmediasystem/avalon,nulib/avalon,avalonmediasystem/avalon,avalonmediasystem/avalon,uvalib/avalon