public List<NodeInfo> getNodeInfo(final ExplorerNode node) {
        return NullSafe.list(NullSafe.get(node, this::getNodeKey, keyToNodeInfoMap::get));
    }
Should only be called after all calls to {@link AbstractTreeModel#add(ExplorerNode, ExplorerNode)}
have been made so all nodes are available
stroom-explorer/stroom-explorer-impl/src/main/java/stroom/explorer/impl/AbstractTreeModel.java