BUG: detect_vertebral_levels: forgot debug line
BUG: detect_vertebral_levels: forgot debug line

Former-commit-id: 7903a905417ac77367e32b7c329d66dc23a5deb9
Former-commit-id: cc1403469f7896dabced2ecab1beebde6cd5223c
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox