handle requests exception in validate_pairs

freqtrade/exchange/__init__.py

@@ -6,6 +6,7 @@ from random import randint
 from typing import List, Dict, Any, Optional
 
 import arrow
+import requests
 from cachetools import cached, TTLCache
 
 from freqtrade.exchange.bittrex import Bittrex
@@ -65,7 +66,12 @@ def validate_pairs(pairs: List[str]) -> None:
     :param pairs: list of pairs
     :return: None
     """
-    markets = _API.get_markets()
+    try:
+        markets = _API.get_markets()
+    except requests.exceptions.RequestException as e:
+        logger.warning('Unable to validate pairs (assuming they are correct). Reason: %s', e)
+        return
+
     stake_cur = _CONF['stake_currency']
     for pair in pairs:
         if not pair.startswith(stake_cur):