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: 7d4ebf01f6ddfeb5db894cc818f636a9e343cd5f [formerly 70339d2cfca943a9db117a610088731940ec4669]
Former-commit-id: bb8bba7c13061a94610a7c76f86c45823736fcdf
Former-commit-id: 62dff3664ef850d9b9d75acffb9486b829f9726d
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox