add:   if (!n) return true; 
context: 	isValid : function(n) {		this._setupRules(); // Will initialize cleanup rules		// Clean the name up a bit		n = n.replace(/[^a-z0-9]+/gi, '').toUpperCase();		return !tinyMCE.getParam('cleanup') || this.vElementsRe.test(n);	},
meta: 2801	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/2801/102b6f3413e1ecf53b2288ed66aa7937bcf2a3da/tiny_mce_src.js/buggy/jscripts/tiny_mce/tiny_mce_src.js