From be70c4f959b76bc40ccfc774a5c3e2f738c75baa Mon Sep 17 00:00:00 2001
From: hroff-1902 <hroff_raeyd9tzpttf@mail.ru>
Date: Wed, 3 Jul 2019 12:50:27 +0300
Subject: [PATCH] handle empty markets from ccxt

---
 freqtrade/exchange/exchange.py | 18 ++++++++++--------
 freqtrade/utils.py             |  4 ++++
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index 521be7b71..7f14b8043 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -208,14 +208,16 @@ class Exchange(object):
         if this was requested in parameters.
         """
         markets = self.markets
-        if base_currency:
-            markets = {k: v for k, v in markets.items() if v['base'] == base_currency}
-        if quote_currency:
-            markets = {k: v for k, v in markets.items() if v['quote'] == quote_currency}
-        if pairs_only:
-            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']}
+        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:
+                markets = {k: v for k, v in markets.items() if v['quote'] == quote_currency}
+            if pairs_only:
+                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:
diff --git a/freqtrade/utils.py b/freqtrade/utils.py
index a73236a0e..7779d3d7b 100644
--- a/freqtrade/utils.py
+++ b/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)} " +