BUG: msct_register: fixed stupid bug
BUG: msct_register: fixed stupid bug

Former-commit-id: e2bce110243cbf2d4e96f7978270fd1ea1168e58 [formerly 9732c0035c5bf48704bb5db13c23d53fbc6d9642]
Former-commit-id: 110c35cabd973f0c9750cbb607b67fb7c9fcbd53
Former-commit-id: 21a8e99a3fb1ff3bcf2f940861b8bb97037d3978
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox