REF: remove exception raising because not as clear as program exiting
REF: remove exception raising because not as clear as program exiting

Former-commit-id: 2753f44fccdf5cbd5401c53317c57e4f32a33860 [formerly aacecd2ce1367c46349c605631ca9f419d8815d5]
Former-commit-id: 647a011fe844a942872dc6f947c33aa40531e118
Former-commit-id: 69c02d118a0f1d7acbdccd4892bc2ffc4aa4f95b
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox