BUG: take output exp from specified output name (Fix #691)
BUG: take output exp from specified output name (Fix #691)

Former-commit-id: 8b6afdeb1d41f8b9be640bf6586f16e9635ab326
Former-commit-id: c6c0bb2b229b19f7046a2cd834526b41732b292e
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox