BUG: fixed #615
BUG: fixed #615

Former-commit-id: a6038035363993439328c409f8d625c2af455862
Former-commit-id: c8d93c3de8396761124955d9b533497e57040084
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox