BUG: detect_vertebral_labeling: fixed bug with flag initz
BUG: detect_vertebral_labeling: fixed bug with flag initz

Former-commit-id: 0ca5bb174c9a3667d4f4d07fddb5f82f03a6fb29
Former-commit-id: c10566a67c738dcae3465dae4b8bc19444e56d50
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox