@arokem this is ready for review / merge. All of the changes in AFQ/segmentation.py are because of indent after: if len(possible_fibers) > 0: (so not a lot has actually changed here)

Does that if need an else clause? Raise a warning?

There is already this line:

Oh! That works. I'll wait for the docbuild to finish and then merge this.

OR still seems to be pretty finicky. But I think we should solve that elsewhere, so merging.