Hi Eric,

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> If you call "C-c C-c" within a table to align it, and point happens to
> be on a horizontal rule, it throws an error that originates in
> org-element-context.

This is now fixed with the attached patch, thanks for reporting
this bug.

If think `org-element-table-row-parser' is doing the right thing by
not assigning a :contents-begin and a :contents-end to table rules,
as they have no content.  

So the fix should go directly in `org-element-context'.  Just stating
this in case Nicolas wants to double-check.