fix: use getter to read first config validator (#3969)

* fix: use getter to read first config validator

Getter checks that there is at least a validator configured and
otherwise returns a proper error

* chore: update changelog

changelog.md

@@ -11,6 +11,7 @@
 
 - [#3953](https://github.com/ignite/cli/pull/3953) Fix apps `Stdout` is redirected to `Stderr`
 - [#3863](https://github.com/ignite/cli/pull/3963) Fix breaking issue for app client API when reading app chain info
+- [#3969](https://github.com/ignite/cli/pull/3969) Get first config validator using a getter to avoid index errors
 
 ## [`v28.2.0`](https://github.com/ignite/cli/releases/tag/v28.2.0)
 

ignite/cmd/chain_debug.go

@@ -8,6 +8,7 @@ import (
 	"github.com/spf13/cobra"
 
 	cmdmodel "github.com/ignite/cli/v28/ignite/cmd/model"
+	chainconfig "github.com/ignite/cli/v28/ignite/config/chain"
 	"github.com/ignite/cli/v28/ignite/pkg/chaincmd"
 	"github.com/ignite/cli/v28/ignite/pkg/cliui"
 	"github.com/ignite/cli/v28/ignite/pkg/cliui/icons"
@@ -117,8 +118,11 @@ func chainDebug(cmd *cobra.Command, session *cliui.Session) error {
 		return err
 	}
 
-	// TODO: Replace by config.FirstValidator when PR #3199 is merged
-	validator := cfg.Validators[0]
+	validator, err := chainconfig.FirstValidator(cfg)
+	if err != nil {
+		return err
+	}
+
 	servers, err := validator.GetServers()
 	if err != nil {
 		return err

ignite/services/chain/chain.go

@@ -206,7 +206,12 @@ func (c *Chain) RPCPublicAddress() (string, error) {
 		if err != nil {
 			return "", err
 		}
-		validator := conf.Validators[0]
+
+		validator, err := chainconfig.FirstValidator(conf)
+		if err != nil {
+			return "", err
+		}
+
 		servers, err := validator.GetServers()
 		if err != nil {
 			return "", err