Merge r1917017, r1923218 from trunk:

Merge r1917017, r1923218 from trunk:

* server/core.c (set_override): Catch errors returned by
  set_allow_opts() for a parsing fail in an Options= argument.

Submitted by: Zhou Qingyang <zhou1615 umn.edu>
Github: closes #310

Add a Changes entry related to r1917017

While at it, fix a small style issue (tab vs spaces)

Submitted by: jorton, jailletc36
Reviewed by: rjung (reduce code drift), jorton, jailletc36

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1923804 13f79535-47bb-0310-9956-ffa450edef68