Another temporary fix for media_part_info

plexpy/notification_handler.py

@@ -332,6 +332,7 @@ def build_media_notify_params(notify_action=None, session=None, timeline=None, *
             media_part_info = media_info['parts'][0]
 
     stream_video = stream_audio = stream_subtitle = False
+    if 'streams' in media_part_info:
         for stream in media_part_info['streams']:
             if not stream_video and stream['type'] == '1':
                 media_part_info.update(stream)