handle empty markets from ccxt

freqtrade/exchange/exchange.py

@@ -208,6 +208,7 @@ class Exchange(object):
         if this was requested in parameters.
         """
         markets = self.markets
+        if markets is not None:
             if base_currency:
                 markets = {k: v for k, v in markets.items() if v['base'] == base_currency}
             if quote_currency:
@@ -216,6 +217,7 @@ class Exchange(object):
                 markets = {k: v for k, v in markets.items() if symbol_is_pair(v['symbol'])}
             if active_only:
                 markets = {k: v for k, v in markets.items() if v['active']}
+
         return markets
 
     def klines(self, pair_interval: Tuple[str, str], copy=True) -> DataFrame:

freqtrade/utils.py

@@ -2,6 +2,7 @@ import logging
 from argparse import Namespace
 from typing import Any, Dict
 
+from freqtrade import OperationalException
 from freqtrade.configuration import Configuration
 from freqtrade.exchange import available_exchanges, Exchange
 from freqtrade.misc import plural
@@ -67,6 +68,9 @@ def start_list_pairs(args: Namespace, pairs_only: bool = False) -> None:
                                  pairs_only=pairs_only,
                                  active_only=args.active_only)
 
+    if pairs is None:
+        raise OperationalException(f"No markets info available for exchange \"{exchange.name}\"")
+
     if args.print_list:
         # print data as a list
         print(f"Exchange {exchange.name} has {len(pairs)} " +