Bitcoin sensor use warning instead of error (#3103)

homeassistant/components/sensor/bitcoin.py

@@ -17,6 +17,16 @@ from homeassistant.util import Throttle
 
 REQUIREMENTS = ['blockchain==1.3.3']
 
+_LOGGER = logging.getLogger(__name__)
+
+CONF_CURRENCY = 'currency'
+
+DEFAULT_CURRENCY = 'USD'
+
+ICON = 'mdi:currency-btc'
+
+MIN_TIME_BETWEEN_UPDATES = timedelta(minutes=5)
+
 OPTION_TYPES = {
     'exchangerate': ['Exchange rate (1 BTC)', None],
     'trade_volume_btc': ['Trade volume', 'BTC'],
@@ -41,20 +51,12 @@ OPTION_TYPES = {
     'market_price_usd': ['Market price', 'USD']
 }
 
-ICON = 'mdi:currency-btc'
-CONF_CURRENCY = 'currency'
-
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
     vol.Required(CONF_DISPLAY_OPTIONS, default=[]):
-        [vol.In(OPTION_TYPES)],
-    vol.Optional(CONF_CURRENCY, default='USD'): cv.string,
+        vol.All(cv.ensure_list, [vol.In(OPTION_TYPES)]),
+    vol.Optional(CONF_CURRENCY, default=DEFAULT_CURRENCY): cv.string,
 })
 
-_LOGGER = logging.getLogger(__name__)
-
-# Return cached results if last scan was less then this time ago.
-MIN_TIME_BETWEEN_UPDATES = timedelta(minutes=5)
-
 
 def setup_platform(hass, config, add_devices, discovery_info=None):
     """Setup the Bitcoin sensors."""
@@ -63,8 +65,9 @@ def setup_platform(hass, config, add_devices, discovery_info=None):
     currency = config.get(CONF_CURRENCY)
 
     if currency not in exchangerates.get_ticker():
-        _LOGGER.error('Currency "%s" is not available. Using "USD"', currency)
-        currency = 'USD'
+        _LOGGER.warning('Currency "%s" is not available. Using "USD"',
+                        currency)
+        currency = DEFAULT_CURRENCY
 
     data = BitcoinData()
     dev = []