OPT: check if mind-toolkit is installed in the image conversion script
OPT: check if mind-toolkit is installed in the image conversion script

Former-commit-id: 70339d2cfca943a9db117a610088731940ec4669
Former-commit-id: bb8bba7c13061a94610a7c76f86c45823736fcdf
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox