*) mod_dav.c: allow PUT to a WORKING resource (this actually the only valid

   place to do a PUT(!))

*) util.c: add a comment. allow validation to proceed without a lock
   database (the rest of the code supported it; one erroneous check disabled
   that work)

*) util_lock.c: allow dav_unlock() to be a no-op when a lock provide isn't
   present; this allows DELETE to work.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88508 13f79535-47bb-0310-9956-ffa450edef68