[Best practice] Test for Object in Class sheets

Hi, I'd like to propose the following best practice: to test for Object existence in class sheets. For example: #set($obj = $doc.getObject("XWiki.XWikiUsers")) #if($obj) ... #else This stylesheet must be applied on a document containing a XWiki.XWikiUsers object. #end If you're all ok I'll add it to the dev guide on http://www.xwiki.org/ xwiki/bin/view/DevGuide/BestPractices (I'll remove what's in there and send each best practice separately to this list for agreement as this is old stuff). Thanks -Vincent