From 03b62642ab498aca8b55607c3e809c7e081faaa1 Mon Sep 17 00:00:00 2001
From: Ken Odegard <kodegard@anaconda.com>
Date: Thu, 21 Nov 2024 12:43:47 -0600
Subject: [PATCH 1/2] Update main_build.py

---
 conda_build/cli/main_build.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/conda_build/cli/main_build.py b/conda_build/cli/main_build.py
index 3d9e43a5fb..221299b485 100644
--- a/conda_build/cli/main_build.py
+++ b/conda_build/cli/main_build.py
@@ -512,7 +512,7 @@ def parse_args(args: Sequence[str] | None) -> tuple[ArgumentParser, Namespace]:
 
     # TODO: Remove in 25.1
     if (
-        all(not arg.startswith("--package-format") for arg in args)
+        all(not arg.startswith("--package-format") for arg in (args or []))
         and warn_about_default_pkg_format
         and "purge" not in parsed.recipe
         and "purge-all" not in parsed.recipe

From 1a8dac786a0093b99f9f3e3e48b8130fcc128a0f Mon Sep 17 00:00:00 2001
From: Ken Odegard <kodegard@anaconda.com>
Date: Thu, 21 Nov 2024 12:47:33 -0600
Subject: [PATCH 2/2] Add news

---
 news/5550-fix-TypeError-no-arguments | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 news/5550-fix-TypeError-no-arguments

diff --git a/news/5550-fix-TypeError-no-arguments b/news/5550-fix-TypeError-no-arguments
new file mode 100644
index 0000000000..08f22156d9
--- /dev/null
+++ b/news/5550-fix-TypeError-no-arguments
@@ -0,0 +1,19 @@
+### Enhancements
+
+* <news item>
+
+### Bug fixes
+
+* Fix `TypeError` when no CLI arguments are passed. (#5549 via #5550)
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>