*/
public static Deferred<Branch> fetchBranchOnly(final TSDB tsdb,
final byte[] branch_id) {
final GetRequest get = new GetRequest(tsdb.treeTable(), branch_id);
get.family(Tree.TREE_FAMILY());
get.qualifier(BRANCH_QUALIFIER);
/**
* Called after the get returns with or without data. If we have data, we'll
* parse the branch and return it.