should return null if no facets found

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1581639 13f79535-47bb-0310-9956-ffa450edef68
fix unit test when searching project version

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1581640 13f79535-47bb-0310-9956-ffa450edef68
use trunk in scm

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1581641 13f79535-47bb-0310-9956-ffa450edef68