fix for issue #915

Added undefined check at line 76 to prevent an uncaught type error which was occurring when the class attribute was encountered.

archive/v0.2.2-rc.1/tools/template-converter.js

@@ -73,6 +73,7 @@ window.templateConverter = (function () {
 
 			each(Object.keys(el.attrs).sort(), function (attrName) {
 				if (attrName === "style") return
+				if(el.attrs[attrName]===undefined) return;
 				virtual += "[" + attrName + "='"
 				virtual += el.attrs[attrName].replace(/'/g, "\\'") + "']"
 			})