provide better fallback if uiRootPath config setting cannot be found or is empty

Author: mojavelinux

src/js/06-copy-to-clipboard.js

@@ -6,9 +6,9 @@
   var TRAILING_SPACE_RX = / +$/gm
 
   var config = (document.getElementById('site-script') || { dataset: {} }).dataset
-  var uiRootPath = config.uiRootPath == null ? '.' : config.uiRootPath
-  var svgAs = config.svgAs
   var supportsCopy = window.navigator.clipboard
+  var svgAs = config.svgAs
+  var uiRootPath = (config.uiRootPath == null ? window.uiRootPath : config.uiRootPath) || '.'
 
   ;[].slice.call(document.querySelectorAll('.doc pre.highlight, .doc .literalblock pre')).forEach(function (pre) {
     var code, language, lang, copy, toast, toolbox