handle empty fileList

[jimmywarting]

I just notice from working with busboy that when submitting a empty filelist the default browser algoritm is to post a empty file with a empty filename

example:

<form id="$form">
  <input type="file", name="landscape">
</form>

<script>
  var fd = new FormData($form)
  console.log([...fd]) // [ ["landscape", <File name: "" size: 0> ] ]
</script>

This polyfill don't take that into consideration. it don't append a empty file

  var fd = new FormDataPolyfill($form)
  console.log([...fd]) // []

---

Appending or not appending a empty file don't bother me. I don't use this polyfill anyway ^^ If at least one person wants to see this being supported then i can fix it.

I would have preferred if the formdata + HTML's form submission algorithm didn't post a empty field anyway.

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