Revision 511371

avoid NPE when a user requests <host>:<port>/foo.
see bug http://issues.apache.org/bugzilla/show_bug.cgi?id=41694.
* make URLInformation handle null strings gracefully
* check for null strings in DocumentPolicyManagerWrapper

additionally, redirect "*" to "index.html" in global-sitemap.xmap to
avoid spurious authentication warnings.
FIXME: a request of the form <pub-id> without a trailing slash is not
yet handled - it triggers a login usecase, but permission is not granted
regardless of credentials.