Fix playlists with size 50i ∀ i∉ℕ (Closes #782)

diff --git a/youtube_dl/InfoExtractors.py b/youtube_dl/InfoExtractors.py
index cf31970ef5a5b778de64a9a021483dcc7df192f8..bac3a747d6ffcecc36af4e4518f8f97c118568c0 100755 (executable)
--- a/youtube_dl/InfoExtractors.py
+++ b/youtube_dl/InfoExtractors.py
@@ -1778,9 +1778,13 @@ class YoutubePlaylistIE(InfoExtractor):
                 self._downloader.report_error(u'Invalid JSON in API response: ' + compat_str(err))
                 return
 
-            if not 'feed' in response or not 'entry' in response['feed']:
+            if 'feed' not in response:
                 self._downloader.report_error(u'Got a malformed response from YouTube API')
                 return
+            if 'entry' not in response['feed']:
+                # Number of videos is a multiple of self._MAX_RESULTS
+                break
+
             videos += [ (entry['yt$position']['$t'], entry['content']['src'])
                         for entry in response['feed']['entry']
                         if 'content' in entry ]