[commands] improve progress output

Author: capcom6

internal/commands/messages/batch/batch_send.go

@@ -375,9 +375,11 @@ func runBatchSend(
 
 	out := make([]batchRowResult, 0, len(rows))
 	for result := range results {
-		state := string(result.State.State)
+		var state string
 		if result.Error != nil {
 			state = fmt.Sprintf("failed: %s", result.Error.Error())
+		} else {
+			state = string(result.State.State)
 		}
 		fmt.Fprintf(os.Stderr, "[%d] %s: %s\n", result.RowNumber, result.Identifier, state)
 		out = append(out, result)