fix: add a error log when author not found for the block that will be emitted to ethstats (#427)

Co-authored-by: wjrjerome <wjrjerome@babylonchain.io>

ethstats/ethstats.go

@@ -94,13 +94,14 @@ type Service struct {
 // websocket.
 //
 // From Gorilla websocket docs:
-//   Connections support one concurrent reader and one concurrent writer.
-//   Applications are responsible for ensuring that no more than one goroutine calls the write methods
-//     - NextWriter, SetWriteDeadline, WriteMessage, WriteJSON, EnableWriteCompression, SetCompressionLevel
-//   concurrently and that no more than one goroutine calls the read methods
-//     - NextReader, SetReadDeadline, ReadMessage, ReadJSON, SetPongHandler, SetPingHandler
-//   concurrently.
-//   The Close and WriteControl methods can be called concurrently with all other methods.
+//
+//	Connections support one concurrent reader and one concurrent writer.
+//	Applications are responsible for ensuring that no more than one goroutine calls the write methods
+//	  - NextWriter, SetWriteDeadline, WriteMessage, WriteJSON, EnableWriteCompression, SetCompressionLevel
+//	concurrently and that no more than one goroutine calls the read methods
+//	  - NextReader, SetReadDeadline, ReadMessage, ReadJSON, SetPongHandler, SetPingHandler
+//	concurrently.
+//	The Close and WriteControl methods can be called concurrently with all other methods.
 type connWrapper struct {
 	conn *websocket.Conn
 
@@ -674,7 +675,10 @@ func (s *Service) assembleBlockStats(block *types.Block) *blockStats {
 		txs = []txStats{}
 	}
 	// Assemble and return the block stats
-	author, _ := s.engine.Author(header)
+	author, err := s.engine.Author(header)
+	if err != nil {
+		log.Error("Failed to retrieve block author", "err", err, "number", header.Number, "hash", header.Hash())
+	}
 
 	return &blockStats{
 		Number:     header.Number,