From 6bdb2fe5a03b33c5fd14a0bc0195fa229ce65da8 Mon Sep 17 00:00:00 2001
From: ChristianKuehnel <christian.kuehnel@gmail.com>
Date: Tue, 27 Feb 2018 07:42:32 +0100
Subject: [PATCH] fix for
 https://github.com/home-assistant/home-assistant/issues/12673 (#12726)

---
 homeassistant/components/sensor/alpha_vantage.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/homeassistant/components/sensor/alpha_vantage.py b/homeassistant/components/sensor/alpha_vantage.py
index 81c84a7f918..896497a93d5 100644
--- a/homeassistant/components/sensor/alpha_vantage.py
+++ b/homeassistant/components/sensor/alpha_vantage.py
@@ -70,8 +70,8 @@ def setup_platform(hass, config, add_devices, discovery_info=None):
     from alpha_vantage.foreignexchange import ForeignExchange
 
     api_key = config.get(CONF_API_KEY)
-    symbols = config.get(CONF_SYMBOLS)
-    conversions = config.get(CONF_FOREIGN_EXCHANGE)
+    symbols = config.get(CONF_SYMBOLS, [])
+    conversions = config.get(CONF_FOREIGN_EXCHANGE, [])
 
     if not symbols and not conversions:
         msg = 'Warning: No symbols or currencies configured.'