Added {optional} plugin that just prints an optional var without any notice if it doesn't exist

CHANGELOG

@@ -6,6 +6,8 @@
   check all works fine still
 
 [2009--] 1.1.1
++ Added {optional} plugin that just prints an optional var without any
+  notice if it doesn't exist
 + Added Dwoo::setTemplate() for testing purposes mostly
 * Fixed a security issue, if you didn't use a custom compiler factory but
   passed the compiler directly to the get method with autoEscape enabled,

lib/plugins/builtin/functions/optional.php

+<?php
+
+/**
+ * Prints out a variable without any notice if it doesn't exist
+ *
+ * <pre>
+ *  * value : the variable to print
+ * </pre>
+ * This software is provided 'as-is', without any express or implied warranty.
+ * In no event will the authors be held liable for any damages arising from the use of this software.
+ *
+ * @author     Jordi Boggiano <j.boggiano@seld.be>
+ * @copyright  Copyright (c) 2008, Jordi Boggiano
+ * @license    http://dwoo.org/LICENSE   Modified BSD License
+ * @link       http://dwoo.org/
+ * @version    1.1.1
+ * @date       2009-10-18
+ * @package    Dwoo
+ */
+function Dwoo_Plugin_optional_compile(Dwoo_Compiler $compiler, $value)
+{
+	return $value;
+}