Use most recent blockNumber when blockNumber parame is nil

cmd/get_logs/main.go

@@ -15,6 +15,7 @@ func main() {
 	environment := flag.String("environment", "", "Environment name")
 	contractHash := flag.String("contract-hash", "", "Contract hash to show summary")
 	_blockNumber := flag.Int64("block-number", -1, "Block number of summary")
+
 	flag.Parse()
 
 	config := cmd.LoadConfig(*environment)

pkg/geth/geth_blockchain.go

@@ -24,6 +24,9 @@ type GethBlockchain struct {
 }
 
 func (blockchain *GethBlockchain) GetLogs(contract core.Contract, blockNumber *big.Int) ([]core.Log, error) {
+	if blockNumber == nil {
+		blockNumber = blockchain.latestBlock()
+	}
 	contractAddress := common.HexToAddress(contract.Hash)
 	fc := ethereum.FilterQuery{
 		FromBlock: blockNumber,