ob-core: Fix results removal without blank line between source and results
* lisp/ob-core.el (org-babel-remove-result): Delete blank lines before
results.
(org-babel-result-end): Use `org-element-at-point'.
* testing/lisp/test-ob.el (test-ob-verify-result-and-removed-result):
Remove duplicate.
* testing/lisp/test-ob.el (test-ob/org-babel-remove-result--no-blank-line):
New test.
* testing/lisp/test-ob.el (test-ob/results-in-narrowed-buffer): Small
refactoring.
Reported-by: Ken Mankoff <mankoff@gmail.com>
<http://lists.gnu.org/archive/html/emacs-orgmode/2017-11/msg00338.html>