Fixes issue #21347 related to google_chronicle_rule_deployment resource (#13130) (GoogleCloudPlatform#3519)

[upstream:fd7a3f65afaeeb3a7fae27e42c5f1664050804e5]

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

tfplan2cai/converters/google/resources/services/chronicle/chronicle_rule_deployment.go

@@ -19,11 +19,20 @@ package chronicle
 import (
 	"reflect"
 
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
+
 	"github.com/GoogleCloudPlatform/terraform-google-conversion/v6/tfplan2cai/converters/google/resources/cai"
 	"github.com/hashicorp/terraform-provider-google-beta/google-beta/tpgresource"
 	transport_tpg "github.com/hashicorp/terraform-provider-google-beta/google-beta/transport"
 )
 
+func chronicleRuleDeploymentNilRunFrequencyDiffSuppressFunc(_, old, new string, _ *schema.ResourceData) bool {
+	if new == "" {
+		return true
+	}
+	return false
+}
+
 const ChronicleRuleDeploymentAssetType string = "{{location}}-chronicle.googleapis.com/RuleDeployment"
 
 func ResourceConverterChronicleRuleDeployment() cai.ResourceConverter {