[YoutubeDL] format spec: fix handling of '/' with ','

When using 'bestvideo/best,bestaudio', 'bestvideo/best' must be set as the current_selector (instead of appending it to the selectors), otherwise when it gets the ',' it would append 'None' to the selectors.

1 files changed, 1 insertions, 2 deletions

diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index 5deb4848e..5a79e5f1d 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -958,8 +958,7 @@ class YoutubeDL(object):
                     elif string == '/':
                         first_choice = current_selector
                         second_choice = _parse_format_selection(tokens, inside_choice=True)
-                        current_selector = None
-                        selectors.append(FormatSelector(PICKFIRST, (first_choice, second_choice), []))
+                        current_selector = FormatSelector(PICKFIRST, (first_choice, second_choice), [])
                     elif string == '[':
                         if not current_selector:
                             current_selector = FormatSelector(SINGLE, 'best', [])