BUG: fix small bug when using flag -ratio ==> don't stop the script if the tmp folder is not successfully removed (only display warning)
BUG: fix small bug when using flag -ratio ==> don't stop the script if the tmp folder is not successfully removed (only display warning)

3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox