[ie/threads] Fix multi mixed media extraction

yt_dlp/extractor/threads.py

@@ -75,7 +75,7 @@ class ThreadsIE(InfoExtractor):
                     thumbnails = []
 
                     # Videos
-                    if (post.get('carousel_media') is not None):  # Handle multiple videos posts
+                    if post.get('carousel_media') is not None:  # Handle multiple videos posts
                         media_list = post.get('carousel_media')
                     else:
                         media_list = [post]
@@ -83,6 +83,7 @@ class ThreadsIE(InfoExtractor):
                     for media in media_list:
                         videos = media.get('video_versions')
 
+                        if videos:
                             for video in videos:
                                 formats.append({
                                     'format_id': '%s-%s' % (media.get('pk'), video['type']),  # id-type