REF: msct_image>loadFromPath: removed check if file exist
REF: msct_image>loadFromPath: removed check if file exist

Former-commit-id: dd641a9257f5fc7e4d19c91c9798ff6b7ac1d574 [formerly 77c98134efa533adbd127ae0ff862de83ca8443b]
Former-commit-id: 59b994a1ca30393a23b726cab90d1630757cc651
Former-commit-id: 8cc7e9037ea00ba673fe7d649a0d15774868bc26
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox