WasteManagement sections removing issue

[Rayn2402]

While using SkylineBlWm I had an issue with guillotine.py

In function self._add_rect we can see the following lines (187-189) :

# Remove section, split and store results
self._sections.remove(section)
self._split(section, width, height)

Which remove the concerned section and then execute the split.

However, self._split function can sometimes call self._split_horizontal which has the following lines of code (66-69) :

 # First remove the section we are splitting so it doesn't 
 # interfere when later we try to merge the resulting split
 # rectangles, with the rest of free sections.
 self._sections.remove(section)

When this situation occurs, self._section tries to remove a section that has already ben removed earlier and we get an error.

This line should probably be deleted from self._split_horizontal

Thank you!