diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 5b9844474..f5ad7ae06 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -977,7 +977,7 @@ class InfoExtractor(object):
             video_info['id'] = playlist_id
         if playlist_title:
             video_info['title'] = playlist_title
-        if playlist_description is not None:
+        if playlist_description:
             video_info['description'] = playlist_description
         return video_info
 
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 0983357f5..7f482ed3a 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -2807,7 +2807,7 @@ class YoutubeTabIE(YoutubeBaseInfoExtractor):
             playlist_id=playlist_id, playlist_title=title,
             playlist_description=description,
             view_count=view_count,
-            last_update=last_updated)
+            last_updated=last_updated)
         playlist.update(self._extract_uploader(data))
         return playlist