minor fixes

Author: harisang

src/apis/web3api.py

@@ -68,7 +68,7 @@ def get_filtered_receipts(
 
     def get_tx_hashes_by_block(
         self, start_block: int, end_block: int
-    ) -> Optional[list[str]]:
+    ) -> list[str]:
         """
         Function filters hashes by contract address, and block ranges
         """
@@ -80,7 +80,7 @@ def get_tx_hashes_by_block(
         )
 
         if log_receipts is None:
-            return None
+            return []
         settlement_hashes_list = list(
             {log_receipt["transactionHash"].hex() for log_receipt in log_receipts}
         )

src/monitoring_tests/cost_coverage_zero_signed_fee.py

@@ -38,7 +38,7 @@ def cost_coverage(self, competition_data: dict[str, Any], gas_cost: float) -> bo
         ucp = solution["clearingPrices"]
         orders = solution["orders"]
         native_prices = competition_data["auction"]["prices"]
-        total_fee = 0
+        total_fee = 0.0
         for order in orders:
             order_data = self.orderbook_api.get_order_data(order["id"])
             if order_data is None: