fix delete auth_option npe

Author: Kagashino

tencentcloud/resource_tc_kubernetes_cluster.go

@@ -1547,18 +1547,20 @@ func tkeGetAuthOptions(d *schema.ResourceData) *tke.ModifyClusterAuthenticationO
 	raw, ok := d.GetOk("auth_options")
 	options := raw.([]interface{})
 
-	if !ok || len(options) == 0 {
-		return nil
-	}
-
-	option := options[0].(map[string]interface{})
 	request := tke.NewModifyClusterAuthenticationOptionsRequest()
 	request.ClusterId = helper.String(d.Id())
-
 	request.ServiceAccounts = &tke.ServiceAccountAuthenticationOptions{
 		AutoCreateDiscoveryAnonymousAuth: helper.Bool(false),
+		Issuer: helper.String(""),
+		JWKSURI: helper.String(""),
 	}
 
+	if !ok || len(options) == 0 {
+		return request
+	}
+
+	option := options[0].(map[string]interface{})
+
 	if v, ok := option["auto_create_discovery_anonymous_auth"]; ok {
 		request.ServiceAccounts.AutoCreateDiscoveryAnonymousAuth = helper.Bool(v.(bool))
 	}