node_tools : New Node & Undefined Property stdClass::$nid + stdClass::$vid

During creation of new node, the first call at hook_nodeapi($op = presave) the $node->nid, $node->vid are empty and node_tools try to do defined some node revision property.

<?php
  switch ($op) {
    case 'presave':
    case 'load': // get here immediately after the node is fetched from db
      if (!isset($node->current_revision_id)) {
        $node->current_revision_id = node_tools_get_current_node_revision_id($node->nid);
        $node->is_current = node_tools_revision_is_current($node);
        $node->num_revisions = node_tools_get_number_of_revisions($node->nid);
      }
?>

I think that is useless and mode add warnings in my simpletest :)

I propose this patch

<?php
  switch ($op) {
    case 'presave':
    case 'load': // get here immediately after the node is fetched from db
      if (!isset($node->current_revision_id) && isset($node->nid)) {
        $node->current_revision_id = node_tools_get_current_node_revision_id($node->nid);
        $node->is_current = node_tools_revision_is_current($node);
        $node->num_revisions = node_tools_get_number_of_revisions($node->nid);
      }
?>