OAK-798: Review / refactor TreeImpl and related classes
reduce usage of deprecated methods: replace Root.getTreeOrNull with Root.getTree in tests

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1478109 13f79535-47bb-0310-9956-ffa450edef68
OAK-798: Review / refactor TreeImpl and related classes
reduce usage of deprecated methods: replace Root.getTreeOrNull with Root.getTree in oak-jcr

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1478110 13f79535-47bb-0310-9956-ffa450edef68