[generic] Don't set the 'title' if it's not defined in the entry (closes #5061)

Some of them may be an 'url' result, which in general don't have the 'title' field.

1 files changed, 3 insertions, 1 deletions

diff --git a/youtube_dl/extractor/generic.py b/youtube_dl/extractor/generic.py
index 875e1bf05..3aff57e30 100644
--- a/youtube_dl/extractor/generic.py
+++ b/youtube_dl/extractor/generic.py
@@ -1208,7 +1208,9 @@ class GenericIE(InfoExtractor):
             return entries[0]
         else:
             for num, e in enumerate(entries, start=1):
-                e['title'] = '%s (%d)' % (e['title'], num)
+                # 'url' results don't have a title
+                if e.get('title') is not None:
+                    e['title'] = '%s (%d)' % (e['title'], num)
             return {
                 '_type': 'playlist',
                 'entries': entries,