From 26441a244b806503de6caf8f02316be21b567a30 Mon Sep 17 00:00:00 2001
From: Mona Lisa <fakemail@mailfake.com>
Date: Thu, 27 Jul 2017 17:11:00 +0000
Subject: [PATCH] Support for empty arrays.

---
 src/upload.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/upload.js b/src/upload.js
index 8da9b27e..95f611dc 100644
--- a/src/upload.js
+++ b/src/upload.js
@@ -259,6 +259,9 @@ ngFileUpload.service('UploadBase', ['$http', '$q', '$timeout', function ($http,
 
     function addFieldToFormData(formData, val, key) {
       if (val !== undefined) {
+        if(Array.isArray(val) && !val.length) {
+          return formData.append(key, '');
+        }
         if (angular.isDate(val)) {
           val = val.toISOString();
         }