Node meta defaults not loaded via hooks

When opengraph_meta_nodeapi() is called with the load op, the node's meta data is supposed to be loaded via load_node_data(). However the call to get_og_tag_defaults() in load_node_data() is never passed the current node. The opengraph_meta array in the $node is not properly populated until after opengraph_meta_nodeapi() is called with the view op.

  public function load_node_data($node) {
    $fields = $this->get_og_tag_defaults();
    // rest of function...
  }

should be

  public function load_node_data($node) {
    $fields = $this->get_og_tag_defaults($node);
    // rest of function...
  }