Solved! Go to Solution.
for lyr in arcpy.mapping.ListLayers(mxd): dsc = arcpy.Describe(lyr) sel_set = dsc.FIDSet if len(sel_set) == 0: print "Nothing selected" else: 'do all the stuff
for lyr in arcpy.mapping.ListLayers(mxd): dsc = arcpy.Describe(lyr) sel_set = dsc.FIDSet if len(sel_set) == 0: print "Nothing selected" else: 'do all the stuff