Apply suggestions from code review
Apply suggestions from code review

Co-Authored-By: Mathias Goncalves <b3b16b33211400412d46537fbf2a81c5e4aa7037@gmail.com>
oesteban/niworkflows,oesteban/niworkflows,oesteban/niworkflows,poldracklab/niworkflows,poldracklab/niworkflows