X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=youtube-dl;a=blobdiff_plain;f=youtube_dl%2Futils.py;h=c9cbd58426e2c63e95d317ef81b01472d2a166c6;hp=fdf5e29e7d417b94ba7f83129a8420f93ed31217;hb=5b232f46dcbdc805507c02edd4fd598f31d544d5;hpb=4bf22f7a1014c55e3358b5a419945071b152eafc

diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index fdf5e29e7..c9cbd5842 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -2733,6 +2733,8 @@ def cli_option(params, command_option, param):
 
 def cli_bool_option(params, command_option, param, true_value='true', false_value='false', separator=None):
     param = params.get(param)
+    if param is None:
+        return []
     assert isinstance(param, bool)
     if separator:
         return [command_option + separator + (true_value if param else false_value)]