[youtube] Fix detection of videos with automatic captions

youtube_dl/extractor/youtube.py

@@ -503,7 +503,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             list_url = caption_url + '&' + list_params
             list_page = self._download_webpage(list_url, video_id)
             caption_list = xml.etree.ElementTree.fromstring(list_page.encode('utf-8'))
-            original_lang = caption_list.find('track').attrib['lang_code']
+            original_lang_node = caption_list.find('track')
+            if original_lang_node.attrib.get('kind') != 'asr' :
+                self._downloader.report_warning(u'Video doesn\'t have automatic captions')
+                return {}
+            original_lang = original_lang_node.attrib['lang_code']
 
             sub_lang_list = {}
             for lang_node in caption_list.findall('target'):