Implement davidshimjs#305

Author: segdeha

qrcode.js

@@ -1113,7 +1113,7 @@ var QRCode;
     return Drawing;
   })();
 
-  var useSVG = document.documentElement.tagName.toLowerCase() === "svg";
+  var useSVG = global.document && document.documentElement.tagName.toLowerCase() === "svg";
 
   // Drawing in DOM by using Table tag
   var Drawing = useSVG