BUG: fixed edge errors on propseg
BUG: fixed edge errors on propseg

Former-commit-id: 46c8f08f78dcc664ae46f401d4465da2301a01c4
Former-commit-id: e108a240674e651f926957e1fcdb3fff0af7eef8
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox