fix(tem): protect read dmarc (#2960)

* fix(tem): protect read dmarc

* fix lint

Author: jremy42

internal/services/tem/domain.go

@@ -242,8 +242,15 @@ func ResourceDomainRead(ctx context.Context, d *schema.ResourceData, m interface
 	_ = d.Set("last_error", domain.LastError) //nolint:staticcheck
 	_ = d.Set("spf_config", domain.SpfConfig)
 	_ = d.Set("dkim_config", domain.DkimConfig)
-	_ = d.Set("dmarc_name", domain.Records.Dmarc.Name)
-	_ = d.Set("dmarc_config", domain.Records.Dmarc.Value)
+
+	if domain.Records != nil && domain.Records.Dmarc != nil {
+		_ = d.Set("dmarc_name", domain.Records.Dmarc.Name)
+		_ = d.Set("dmarc_config", domain.Records.Dmarc.Value)
+	} else {
+		_ = d.Set("dmarc_name", "")
+		_ = d.Set("dmarc_config", "")
+	}
+
 	_ = d.Set("smtp_host", tem.SMTPHost)
 	_ = d.Set("smtp_port_unsecure", tem.SMTPPortUnsecure)
 	_ = d.Set("smtp_port", tem.SMTPPort)