sct_launcher: fixup using exit unconditionally as sct_launcher can be sourced (#1899)
sct_launcher: fixup using exit unconditionally as sct_launcher can be sourced (#1899)


Former-commit-id: c289da452a5894ac853d0cd8b2fc1a92fdc7f1a5
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox