[YT Search] No results if items is not in response

When a query results of 0 items, the key items is not present in the
api_response dictionary, raising a KeyError.

Intead, look for the key and call trouble if it's not present.

diff --git a/youtube_dl/InfoExtractors.py b/youtube_dl/InfoExtractors.py
index d661d517dea96e09819ec52f58cf0205f40b0d72..a9646433ef83e9ef6725d1d3f7a3c5f31139c978 100755 (executable)
--- a/youtube_dl/InfoExtractors.py
+++ b/youtube_dl/InfoExtractors.py
@@ -1478,6 +1478,10 @@ class YoutubeSearchIE(InfoExtractor):
                 return
             api_response = json.loads(data)['data']
 
+            if not 'items' in api_response:
+                self._downloader.trouble(u'[youtube] No video results')
+                return
+
             new_ids = list(video['id'] for video in api_response['items'])
             video_ids += new_ids