I decided not to mess with this article for the purpose of studying this bug:
http://en.wikipedia.org/w/index.php?title=Nonprofit_organization&diff=499397921&oldid=497923589
The extra new line whitespace was not visible or editable when clicking the section edit links that came before or after the whitespace. I had to edit the whole article to remove it.
Version: 1.20.x
Severity: minor