From 029159e97a312f267a944a6f4892b5f9cf93728d Mon Sep 17 00:00:00 2001
From: Jimmy Zelinskie <jimmy.zelinskie+git@gmail.com>
Date: Fri, 19 Aug 2016 16:26:31 -0400
Subject: [PATCH] aci: handle null docker env vars

---
 formats/aci.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/formats/aci.py b/formats/aci.py
index 83ec9f3b9..c24f691bd 100644
--- a/formats/aci.py
+++ b/formats/aci.py
@@ -184,7 +184,7 @@ class ACIImage(TarImageFormatter):
     hostname = hostname.split(':', 1)[0]
 
     # Calculate the environment variables.
-    docker_env_vars = config.get('Env', [])
+    docker_env_vars = config.get('Env', []) or []
     env_vars = []
     for var in docker_env_vars:
       pieces = var.split('=')