From a452a92199a3439f2fb16184904bfb6338590c3a Mon Sep 17 00:00:00 2001
From: Robert Bo Davis <bo@interrobang.consulting>
Date: Thu, 26 Jul 2018 11:10:57 -0400
Subject: [PATCH] Fix referenced before assignment in role requirements

---
 lib/ansible/playbook/role/requirement.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/ansible/playbook/role/requirement.py b/lib/ansible/playbook/role/requirement.py
index 9f3838cfefc..0790404b2fd 100644
--- a/lib/ansible/playbook/role/requirement.py
+++ b/lib/ansible/playbook/role/requirement.py
@@ -190,8 +190,8 @@ class RoleRequirement(RoleDefinition):
 
         def run_scm_cmd(cmd, tempdir):
             try:
-                stdout = None
-                stderr = None
+                stdout = ''
+                stderr = ''
                 popen = Popen(cmd, cwd=tempdir, stdout=PIPE, stderr=PIPE)
                 stdout, stderr = popen.communicate()
             except Exception as e: