Fix itbit

plugins/exchange_rate.py

@@ -186,6 +186,7 @@ class itBit(ExchangeBase):
         ccys = ['USD', 'EUR', 'SGD']
         json = self.get_json('api.itbit.com', '/v1/markets/XBT%s/ticker' % ccy)
         result = dict.fromkeys(ccys)
+        if ccy in ccys:
             result[ccy] = Decimal(json['lastPrice'])
         return result