On the authzperf branch:  Minor optimization.

* subversion/libsvn_repos/authz.c
  (insert_path): Skip the hash lookup for newly created, empty hashes.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/authzperf@1621360 13f79535-47bb-0310-9956-ffa450edef68