[extractor] Do not exit early for unsuitable `url_result`

diff --git a/yt_dlp/extractor/common.py b/yt_dlp/extractor/common.py
index 2091df7fafce774df9a37cbca253ae9428b40ef7..5da12725ae30a8c56e9498aca7892faa8e893096 100644 (file)
--- a/yt_dlp/extractor/common.py
+++ b/yt_dlp/extractor/common.py
@@ -3513,8 +3513,8 @@ def _RETURN_TYPE(cls):
     @classmethod
     def is_single_video(cls, url):
         """Returns whether the URL is of a single video, None if unknown"""
-        assert cls.suitable(url), 'The URL must be suitable for the extractor'
-        return {'video': True, 'playlist': False}.get(cls._RETURN_TYPE)
+        if cls.suitable(url):
+            return {'video': True, 'playlist': False}.get(cls._RETURN_TYPE)
 
     @classmethod
     def is_suitable(cls, age_limit):