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-rw-r--r--test/test_utils.py4
-rw-r--r--youtube_dl/utils.py2
2 files changed, 6 insertions, 0 deletions
diff --git a/test/test_utils.py b/test/test_utils.py
index 7803e5bc7..2aab16b97 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -1182,6 +1182,10 @@ part 3</font></u>
cli_bool_option(
{'nocheckcertificate': False}, '--check-certificate', 'nocheckcertificate', 'false', 'true', '='),
['--check-certificate=true'])
+ self.assertEqual(
+ cli_bool_option(
+ {}, '--check-certificate', 'nocheckcertificate', 'false', 'true', '='),
+ [])
def test_ohdave_rsa_encrypt(self):
N = 0xab86b6371b5318aaa1d3c9e612a9f1264f372323c8c0f19875b5fc3b3fd3afcc1e5bec527aa94bfa85bffc157e4245aebda05389a5357b75115ac94f074aefcd
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)]