Ignore lines from coverage if they can't be tested

lib/eval-script.js

@@ -13,6 +13,7 @@ module.exports = function(el) {
 
   script.type = "text/javascript"
 
+  /* istanbul ignore if */
   if (src !== "") {
     script.src = src
     script.async = false // force synchronous loading of peripheral JS
@@ -23,6 +24,7 @@ module.exports = function(el) {
       script.appendChild(document.createTextNode(code))
     }
     catch (e) {
+      /* istanbul ignore next */
       // old IEs have funky script nodes
       script.text = code
     }