BUG: msct_smooth: fixed bug when number of points is too small-- need to make it cleaner
BUG: msct_smooth: fixed bug when number of points is too small-- need to make it cleaner

Former-commit-id: 038d82364e22503071b72dd2655d31ce546bdf08 [formerly 98492458e0fe3e3dd7e52c6c7d946ddc27f6314e]
Former-commit-id: 95bec297608f527850759a1bdebbc002af2ee4cc
Former-commit-id: aa59d6f41e75ee280302b9a209ff16bc4dd5112f
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox