From dcce70f4b9783fd5a88ba0b855f7eda7f5f2e209 Mon Sep 17 00:00:00 2001
From: Ruslan Kuprieiev <kupruser@gmail.com>
Date: Tue, 24 Sep 2019 16:33:15 +0300
Subject: [PATCH] output: base: checkout: make returns consistent

As reported by deep source: Either all return statements in a function should return an expression, or none of them should.
---
 dvc/output/base.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dvc/output/base.py b/dvc/output/base.py
index 4b360ae56..44220d476 100644
--- a/dvc/output/base.py
+++ b/dvc/output/base.py
@@ -287,7 +287,7 @@ class OutputBase(object):
     def checkout(self, force=False, progress_callback=None, tag=None):
         if not self.use_cache:
             progress_callback(str(self.path_info), self.get_files_number())
-            return
+            return None
 
         if tag:
             info = self.tags[tag]