Remove log for Unexpected missing transaction

- Thanks to that log line we found out that the issue was on safe-eth-py
- It was already fixed on safe-global/safe-eth-py#1439

safe_transaction_service/history/services/index_service.py

@@ -360,11 +360,6 @@ def txs_create_or_update_from_tx_hashes(
                 ethereum_txs_dict[ethereum_tx.tx_hash] = ethereum_tx
         logger.debug("Blocks, transactions and receipts were inserted")
 
-        # TODO Remove, this is meant to detect a bug on production
-        for tx_hash, ethereum_tx in ethereum_txs_dict.items():
-            if not ethereum_tx:
-                logger.error("Unexpected missing tx with tx-hash=%s", tx_hash)
-
         return list(ethereum_txs_dict.values())
 
     @transaction.atomic