BUG: removed argument if user calls -h
BUG: removed argument if user calls -h

Former-commit-id: 3c2d820e7434e524d3785aec8217144a28a87919
Former-commit-id: ec8d3a28fea973fa51e7729939ee2bb828da2c71
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox