From 7ea4a0e89545a122f0dfe02c621dec4c145b70d8 Mon Sep 17 00:00:00 2001
From: Brad Olson <brado@movedbylight.com>
Date: Tue, 29 May 2012 10:23:09 -0400
Subject: [PATCH] Avoid traceback when vars file has no vars items. Could warn
 or fail instead.

---
 lib/ansible/playbook/play.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/ansible/playbook/play.py b/lib/ansible/playbook/play.py
index 400ca7bf65..f884dda9c5 100644
--- a/lib/ansible/playbook/play.py
+++ b/lib/ansible/playbook/play.py
@@ -186,5 +186,7 @@ class Play(object):
 
                 fpath = utils.path_dwim(self.playbook.basedir, utils.template(filename, self.vars))
                 new_vars = utils.parse_yaml_from_file(fpath)
-                self.playbook.SETUP_CACHE[host].update(new_vars)
+                if new_vars:
+                    self.playbook.SETUP_CACHE[host].update(new_vars)
+                #else: could warn if vars file contains no vars.