BUG: msct_image:  re-added initialization of an empty header : fix a bug when getting the dimension of an image saved from a numpy array
BUG: msct_image:  re-added initialization of an empty header : fix a bug when getting the dimension of an image saved from a numpy array

Former-commit-id: 924ed7a0a97ed6d48fb038dc996ec4ff8c6237e7 [formerly 1890e3507082ac46ad7f696cea09e406e8bec9d6]
Former-commit-id: 1432de0b3c853d564985a8f98422b3c2cb74898c
Former-commit-id: b69ef33326e1895466ab5ab9277d5110d3ec27a8
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox