From fca3895430c206fc159e71622ee567f77566980d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Florian=20R=2E=20H=C3=B6lzlwimmer?=
 <Hoeze@users.noreply.github.com>
Date: Sat, 5 Feb 2022 19:01:20 +0100
Subject: [PATCH] fix: fix None type error when invoking Workflow object
 manually (#1366)

* fix none-type

* fix formatting
---
 snakemake/workflow.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/snakemake/workflow.py b/snakemake/workflow.py
index 67ee74aeb..69aae4420 100644
--- a/snakemake/workflow.py
+++ b/snakemake/workflow.py
@@ -204,7 +204,9 @@ def __init__(
         self.attempt = attempt
         self.default_remote_provider = default_remote_provider
         self.default_remote_prefix = default_remote_prefix
-        self.configfiles = list(overwrite_configfiles) or []
+        self.configfiles = (
+            [] if overwrite_configfiles is None else list(overwrite_configfiles)
+        )
         self.run_local = run_local
         self.report_text = None
         self.conda_cleanup_pkgs = conda_cleanup_pkgs