In some edge cases, like when splitting a path on or very close to its
start or end point, `Path.split()` will return an array in which one of
the elements is not a Path object, but rather an empty array.
That is rather combersome to check for, so this changes that behaviour
and will return null for such cases.
I've also updated the documentation to clarify this behaviour.
Fixes#6816
This also fixes a bug when a path was being split on its end point.
This is a flat (without history) import of (some of) the content
from our markdown module.
We've imported this without history because the repo contains our
blog posts and showcases posts content prior to porting them to strapi.
Since this contains many images, it would balloon the size of this repo
to import the full history.
Instead, please refer to the history of the (archived) markdown repo
at: https://github.com/freesewing/markdown
