>> Eli
> Can you tell the details?  Solved where and how?

It wasn't 'solved' per say.. just that org-ellipsis is now not allowed to
be any empty string.

http://orgmode.org/cgit.cgi/org-mode.git/commit/?id=6c498f13375574db873d3d5da100235cfe09a190

Thread on org mode mailing list:
http://lists.gnu.org/archive/html/emacs-orgmode/2017-06/msg00508.html

Thanks for fixing the root cause of this issue.
-- 

Kaushal Modi