object_composition empty contours list
object_composition empty contours list

added an empty contours list to the object_composition test to capture the case where len(ids) = 0

danforthcenter/plantcv,danforthcenter/plantcv,stiphyMT/plantcv,danforthcenter/plantcv,stiphyMT/plantcv,stiphyMT/plantcv