OPT: label_utils: minor change
OPT: label_utils: minor change

Former-commit-id: 011dd6ebb78b4f323b688e10fe238ba2efeb5f6b [formerly a3ac78cb3f1fae6ac834b2a5101f8aa78ac5f1d3]
Former-commit-id: b740fff03c1a8cf423c8e608bed4a781b346bdc6
Former-commit-id: 74a39029f6e0b17d5026edc393239fad39868358
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox