Ensure no None status is passed from "create_order"

freqtrade/exchange/exchange.py

@@ -1079,6 +1079,9 @@ class Exchange:
                 rate_for_order,
                 params,
             )
+            if order.get('status') is None:
+                # Map empty status to open.
+                order['status'] = 'open'
             self._log_exchange_response('create_order', order)
             order = self._order_contracts_to_amount(order)
             return order

tests/exchange/test_exchange.py

@@ -1447,6 +1447,7 @@ def test_buy_considers_time_in_force(default_conf, mocker, exchange_name):
 
     assert 'id' in order
     assert 'info' in order
+    assert order['status'] == 'open'
     assert order['id'] == order_id
     assert api_mock.create_order.call_args[0][0] == 'ETH/BTC'
     assert api_mock.create_order.call_args[0][1] == order_type