REF: default param as a list, not a str
REF: default param as a list, not a str

Former-commit-id: 90d11b01066221a909df215aed6cf84a25417175 [formerly 861892bdbc969ed321e3de5f791abbf010a7b5b2]
Former-commit-id: f88dbbe4ab78dffbe676e906b29ab2838eabce96
Former-commit-id: 7f94f832cb81f4a529cd1ad38f0b98fc88cc2735
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox