fix: handle events only when event handlers are registered

Author: hallazzang

node/process.go

@@ -170,10 +170,12 @@ func (n *Node) handleNewBlock(ctx context.Context, block *rpccoretypes.ResultBlo
 		}
 	}
 
-	for eventIndex, event := range blockResult.FinalizeBlockEvents {
-		err := n.handleEvent(ctx, block.Block.Height, block.Block.Time, latestChainHeight, event)
-		if err != nil {
-			return fmt.Errorf("failed to handle event: finalize block, event_index: %d; %w", eventIndex, err)
+	if len(n.eventHandlers) != 0 {
+		for eventIndex, event := range blockResult.FinalizeBlockEvents {
+			err := n.handleEvent(ctx, block.Block.Height, block.Block.Time, latestChainHeight, event)
+			if err != nil {
+				return fmt.Errorf("failed to handle event: finalize block, event_index: %d; %w", eventIndex, err)
+			}
 		}
 	}