[CCXTConnector] make fall back fees work properly

Author: techfreaque

octobot_trading/exchanges/connectors/ccxt/ccxt_connector.py

@@ -510,13 +510,13 @@ def get_fees(self, symbol):
             return {
                 enums.ExchangeConstantsMarketPropertyColumns.TAKER.value:
                     market_status.get(enums.ExchangeConstantsMarketPropertyColumns.TAKER.value,
-                                      constants.CONFIG_DEFAULT_FEES),
+                                      ) or constants.CONFIG_DEFAULT_FEES,
                 enums.ExchangeConstantsMarketPropertyColumns.MAKER.value:
                     market_status.get(enums.ExchangeConstantsMarketPropertyColumns.MAKER.value,
-                                      constants.CONFIG_DEFAULT_FEES),
+                                      ) or constants.CONFIG_DEFAULT_FEES,
                 enums.ExchangeConstantsMarketPropertyColumns.FEE.value:
                     market_status.get(enums.ExchangeConstantsMarketPropertyColumns.FEE.value,
-                                      constants.CONFIG_DEFAULT_FEES)
+                                      ) or constants.CONFIG_DEFAULT_FEES
             }
         except ccxt.NotSupported:
             raise octobot_trading.errors.NotSupported