Modify the digest authentication checks so they don't mess with

requests that aren't protected with digest authentication. This was
apparently causing some problems with certain setups.

Submitted by: jk@tools.de


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@76532 13f79535-47bb-0310-9956-ffa450edef68