Remove filled if amount is modified to suit fee structure

freqtrade/freqtradebot.py

@@ -1122,6 +1122,7 @@ class FreqtradeBot:
         """
         Checks trades with open orders and updates the amount if necessary
         Handles closing both buy and sell orders.
+        :return: True if order has been cancelled without being filled partially, False otherwise
         """
         # Get order details for actual price per unit
         if trade.open_order_id:
@@ -1131,12 +1132,13 @@ class FreqtradeBot:
                 order = action_order or self.exchange.get_order(trade.open_order_id, trade.pair)
             except InvalidOrderException as exception:
                 logger.warning('Unable to fetch order %s: %s', trade.open_order_id, exception)
-                return
+                return False
             # Try update amount (binance-fix)
             try:
                 new_amount = self.get_real_amount(trade, order, order_amount)
                 if not isclose(order['amount'], new_amount, abs_tol=constants.MATH_CLOSE_PREC):
                     order['amount'] = new_amount
+                    del order['filled']
                     # Fee was applied, so set to 0
                     trade.fee_open = 0
                     trade.recalc_open_trade_price()