Allow acl_edit_form params without acl_id

i'm trying to show the acl_edit_form ie www.example.com/node/add/story but i can't pass the acl_id to acl_edit_form because the node is not yet created and don't have nid

this is mi path to content_access.module to alow show the acl_edit_form in node creation form

function content_access_form_alter($form_id, &$form){
	if (isset($form['#node']) && $form_id == $form['#node']->type .'_node_form') {
		if (content_access_get_settings('per_node', $form['#node']->type)) {
			content_access_form_access($form);
		}
	}
}

function content_access_form_access(&$form) {
	$node=$form['#node'];
	//apply per node settings if necessary
	
 // --------------  

	if (module_exists('acl')) {
		$form['content_access']['acl'] = array(
      '#type' => 'fieldset', 
      '#title' => t('User access control lists'),
      '#description' => t('These settings allow you to grant access to specific users.'),
      '#collapsible' => TRUE,
      '#tree' => TRUE,
		);
		foreach (array('view', 'update', 'delete') as $op) {
			if(isset($node->nid)){
				$acl_id = acl_get_id_by_name('content_access', $op .'_'. $node->nid);
				if (!$acl_id) { // create one
					$acl_id = acl_create_new_acl('content_access', $op .'_'. $node->nid);
					acl_node_add_acl($node->nid, $acl_id, $op == 'view', $op == 'update', $op == 'delete');
				}
				$form['content_access']['acl'][$op] = acl_edit_form($acl_id, 'Grant '. $op .' access');
				$form['content_access']['acl'][$op]['#collapsed'] = !isset($_POST['acl'][$op]['add_button']) && !isset($_POST['acl'][$op]['delete_button']);
			}
			else{
                               //the node is new and don't have nid,  $acl_id
                               //acl_edit_form needs to work without acl_id
				$form['content_access']['acl'][$op] = acl_edit_form('', 'Grant '. $op .' access', true);
				$form['content_access']['acl'][$op]['#collapsed'] = !isset($_POST['acl'][$op]['add_button']) && !isset($_POST['acl'][$op]['delete_button']);
			}
		}
	}
}


function content_access_nodeapi(&$node, $op, $teaser, $page) {
	switch($op){
                  //-----------
		case 'insert':
		case 'update':
			if (content_access_get_settings('per_node', $node->type)) {
				content_access_update($node);
			}
			break;
	}
}

function content_access_update($node){

	$settings = array();
	foreach (array('view', 'update', 'delete') as $op) {

		if (module_exists('acl') && isset($node->acl)) {
                    
                       //I put the creation of new acl in node insert  bacause in this step, node have nid

			$acl_id = acl_get_id_by_name('content_access', $op .'_'. $node->nid);
			if (!$acl_id) { // create one
				$acl_id = acl_create_new_acl('content_access', $op .'_'. $node->nid);
				acl_node_add_acl($node->nid, $acl_id, $op == 'view', $op == 'update', $op == 'delete');
			}
			$acl= $node->acl[$op];
			$acl['acl_id'] = $acl_id;    //modify the acl_id
			acl_save_form($acl);


		}
	}

      //----------------------
}

Content access version: 5.x-1.3