Merge r1734294 from trunk:

followup to r1734125: null check for r->args
before cleaning up some QSA cases.

Submitted by: covener
Reviewed by: covener, rpluem, ylavic
Backported by: ylavic


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1734397 13f79535-47bb-0310-9956-ffa450edef68