BG: fixed bug on sct_warp_template parsing again
BG: fixed bug on sct_warp_template parsing again

Former-commit-id: d5ad1aea5697dda28a31fc815e8ed10169962881
Former-commit-id: e0ac84d3e59144c08b6d39d69004d8d4b19165d1
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox