add: if (!node) return null; 
context: 		dojo.getComputedStyle = ((dojo.isSafari) ? function(node){				var s = dv.getComputedStyle(node, null);				if(!s){ 					node.style.display = ""; 					s = dv.getComputedStyle(node, null);				}				return s;			} : function(node){
meta: 4497	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/4497/156823ccc5030e2386a1b77d63b923457aafc600/html.js/buggy/_base/html.js