[extractor/common] Improve is_suitable

In order to fix breakage introduced by a3aa814b774a413d9e7f4fbfadf06fe6dcc59b25

diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index b8a76e3cb4ae98810fc8c8fe491ff518922b5700..53c28f016065195b9e26849cbab75825a8cdcaa0 100644 (file)
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -1786,7 +1786,7 @@ class InfoExtractor(object):
 
         any_restricted = False
         for tc in self.get_testcases(include_onlymatching=False):
-            if 'playlist' in tc:
+            if tc.get('playlist', []):
                 tc = tc['playlist'][0]
             is_restricted = age_restricted(
                 tc.get('info_dict', {}).get('age_limit'), age_limit)