PueoHSAlign.process_eyescan_eyes returns None as an eye sometimes?

[barawn]

process_eyescan_eyes checks if scan[eye_center] is None: it should actually check if scan[eye_center][1] is None.

        for edge in edges:
            edge_val = int((edge[0] + edge[1])/2)
            eye_center = edge_val - (eye_width//2)
            if eye_center > 0 and scan[eye_center] is not None:
                eyes[scan[eye_center][1]] = eye_center

should be

        for edge in edges:
            edge_val = int((edge[0] + edge[1])/2)
            eye_center = edge_val - (eye_width//2)
            if eye_center > 0 and scan[eye_center][1] is not None:
                eyes[scan[eye_center][1]] = eye_center

But this shouldn't happen in any case, because it should have probably reported an additional edge in the scan and it doesn't appear like it did there.
Change this and catch when it happens, print it out for debugging.

[barawn]

this is related to
#11