Merge pull request #2 from ToothpickFactory/patch-1

Update TranscodingTask.php

Author: VladimirParkhomenko

src/Classes/TranscodingTask.php

@@ -65,7 +65,7 @@ public function __construct($api, $task_token) {
      */
     public function AddStitchVideoItem($url) {
         $item = new StitchVideoItem();
-        if ($this->stitchVideoItems == undefined) {
+        if (!isset($this->stitchVideoItems)) {
             $this->stitchVideoItems = [];
         }
         $item->url = $url;
@@ -219,4 +219,4 @@ public function setSubtitlesCopyMode($value) {
             $this->subtitles->copy = 0;
         }
     }
-}
+}