BUG: fixed issue with order processing

catalyst/exchange/ccxt/ccxt_exchange.py

@@ -877,6 +877,7 @@ class CCXT(Exchange):
         order.commission = exc_order.commission
         order.filled = exc_order.amount
 
+        transactions = []
         if exc_order.status == ORDER_STATUS.FILLED:
             if order.amount > exc_order.amount:
                 log.warn(
@@ -898,7 +899,9 @@ class CCXT(Exchange):
                 order_id=order.id,
                 commission=order.commission,
             )
-        return [transaction]
+            transactions.append(transaction)
+
+        return transactions
 
     def process_order(self, order):
         # TODO: move to parent class after tracking features in the parent