Merge r1634237 from trunk:

fix another case of 304 response sent to an unconditional request

Submitted By: covener
Reviewed By:  covener, jim, ylavic




git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1636001 13f79535-47bb-0310-9956-ffa450edef68