[1.7.0] Convert Image, Legacy and List to use new format.

- Make attribute array parameter optional
- Optimize contents parsing for keywords

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1041 48356398-32a2-884e-a903-53898d9a118a

tests/HTMLPurifier/HTMLModuleTest.php

@@ -58,6 +58,10 @@ class HTMLPurifier_HTMLModuleTest extends UnitTestCase
             $module->parseContents('Flow'),
             array('optional', 'Flow | #PCDATA')
         );
+        $this->assertIdentical(
+            $module->parseContents('Empty'),
+            array('empty', '')
+        );
         
         // normalization procedures
         $this->assertIdentical(