[extractor/common] Make _family_friendly_search optional

diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 4d61275fd2726e4bd96493de1006ab0375f87cdf..e565901afce0ec6999a478ddf21b0b6745a6a966 100644 (file)
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -940,7 +940,8 @@ class InfoExtractor(object):
 
     def _family_friendly_search(self, html):
         # See http://schema.org/VideoObject
-        family_friendly = self._html_search_meta('isFamilyFriendly', html)
+        family_friendly = self._html_search_meta(
+            'isFamilyFriendly', html, default=None)
 
         if not family_friendly:
             return None