Missing newline between TODOs and the next section when not grouping

## Problem description When items are not grouped, there is no empty line between the last item of the TODOs section and the next section, see screen shot: <img width="672" height="212" alt="Image" src="https://github.com/user-attachments/assets/0a48637a-99ac-44ae-884a-f91d921ccda0" /> Note: when items are grouped, there is an empty line. ## What should be changed As magit always has an empty line after an unfolded section, this should also be the case if the TODOs are not grouped.