BUG: detect_vertebral_levels: forgot to assign single peak to variable ind_peak
BUG: detect_vertebral_levels: forgot to assign single peak to variable ind_peak

Former-commit-id: 9eb7c49c2aa9487bf7c2ab3bf7268fe941b931aa [formerly b4f8c42516efb9414b899720cebb94aee08e2908]
Former-commit-id: 37411859daec5c6def90699d60f4352b058f7e3d
Former-commit-id: a996cac76095c7560c690565d0f28143f1a7e672
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox