Fixed an issue with failed orders

catalyst/exchange/algorithm_exchange.py

@@ -401,8 +401,9 @@ class ExchangeTradingAlgorithm(TradingAlgorithm):
         if order_id is not None:
             order = self.portfolio.open_orders[order_id]
             self.perf_tracker.process_order(order)
-
-        return order
+            return order
+        else:
+            return None
 
     def round_order(self, amount):
         """

catalyst/exchange/exchange.py

@@ -531,10 +531,11 @@ class Exchange:
             )
         )
         order = self.create_order(asset, amount, is_buy, style)
-
-        self._portfolio.create_order(order)
-
-        return order.id
+        if order:
+            self._portfolio.create_order(order)
+            return order.id
+        else:
+            return None
 
     @abstractmethod
     def get_open_orders(self, asset):