MATLAB: upsample matlab handle is nan
MATLAB: upsample matlab handle is nan

Former-commit-id: b157628db9916a14d7c406777decee0568b3352b
Former-commit-id: a9622b931c36440165550b3f76a631c390b18e4d
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox