Post sidebar: expanding last section draws an extra line

[BernatBC]

Expected Behavior

Expanding the last section shouldn't draw an extra line (see screenshot).

Current Behavior

Expanding the last section draws an extra line (see screenshot).

Possible Solution

Don't know yet, I'll try to investigate it.

Steps to Reproduce

1. Visit https://bernatbc.tk/posts/
2. Expand the last section (Videogames)

or:

1. Visit https://bernatbc.tk/posts/videogames/

Screenshots

Detailed Description

Only happens when the last item of the sidebar is a section, and you expand that one.