fix input file iteration, closes #60

Author: jimmywarting

FormData.js

@@ -123,7 +123,7 @@ if (typeof FormData === 'undefined' || !FormData.prototype.keys) {
         if (!elm.name || elm.disabled) continue
 
         if (elm.type === 'file')
-          for (let file of elm.files)
+          for (let file of arrayFrom(elm.files || []))
             this.append(elm.name, file)
         else if (elm.type === 'select-multiple' || elm.type === 'select-one')
           for (let opt of arrayFrom(elm.options))

formdata.min.js

@@ -1,6 +1,6 @@
 {
   "name": "formdata-polyfill",
-  "version": "3.0.11",
+  "version": "3.0.12",
   "description": "HTML5 `FormData` polyfill for Browsers.",
   "main": "formdata.min.js",
   "scripts": {