core/rawdb: don't warn for missing "unclean shutdown markers" (#28014)

This changes removes the warn-printout about not finding unclean shutdown markers, which always happens on fresh installs / wiped databases.

core/rawdb/accessors_metadata.go

@@ -111,11 +111,11 @@ const crashesToKeep = 10
 func PushUncleanShutdownMarker(db ethdb.KeyValueStore) ([]uint64, uint64, error) {
 	var uncleanShutdowns crashList
 	// Read old data
-	if data, err := db.Get(uncleanShutdownKey); err != nil {
+	if data, err := db.Get(uncleanShutdownKey); err == nil {
-		log.Warn("Error reading unclean shutdown markers", "error", err)
+		if err := rlp.DecodeBytes(data, &uncleanShutdowns); err != nil {
-	} else if err := rlp.DecodeBytes(data, &uncleanShutdowns); err != nil {
 			return nil, 0, err
 		}
+	}
 	var discarded = uncleanShutdowns.Discarded
 	var previous = make([]uint64, len(uncleanShutdowns.Recent))
 	copy(previous, uncleanShutdowns.Recent)