fix DescribeClusters return parameter parsing code (#2480)

* fix DescribeClusters return parameter parsing code

* add changelog 2480.txt

Author: bruceybian

.changelog/2480.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+resource/tencentcloud_kubernetes_scale_worker: fix DescribeClusters return parameter `Property` parsing code
+```

tencentcloud/internal/helper/helper.go

@@ -256,6 +256,9 @@ func MapToString(param map[string]interface{}) (string, bool) {
 }
 
 func JsonToMap(str string) (map[string]interface{}, error) {
+	if str == "" {
+		return nil, nil
+	}
 	var temp map[string]interface{}
 
 	err := json.Unmarshal([]byte(str), &temp)

tencentcloud/services/tke/service_tencentcloud_tke.go

@@ -377,9 +377,11 @@ func (me *TkeService) DescribeClusters(ctx context.Context, id string, name stri
 			errRet = err
 			return
 		}
-		if projectMap["VpcCniType"] != nil {
-			vpcCniType := projectMap["VpcCniType"].(string)
-			clusterInfo.VpcCniType = vpcCniType
+		if projectMap != nil {
+			if projectMap["VpcCniType"] != nil {
+				vpcCniType := projectMap["VpcCniType"].(string)
+				clusterInfo.VpcCniType = vpcCniType
+			}
 		}
 
 		if len(cluster.TagSpecification) > 0 {
@@ -461,13 +463,15 @@ func (me *TkeService) DescribeCluster(ctx context.Context, id string) (
 		errRet = err
 		return
 	}
-	if projectMap["VpcCniType"] != nil {
-		vpcCniType := projectMap["VpcCniType"].(string)
-		clusterInfo.VpcCniType = vpcCniType
-	}
-	if projectMap["NetworkType"] != nil {
-		networkType := projectMap["NetworkType"].(string)
-		clusterInfo.NetworkType = networkType
+	if projectMap != nil {
+		if projectMap["VpcCniType"] != nil {
+			vpcCniType := projectMap["VpcCniType"].(string)
+			clusterInfo.VpcCniType = vpcCniType
+		}
+		if projectMap["NetworkType"] != nil {
+			networkType := projectMap["NetworkType"].(string)
+			clusterInfo.NetworkType = networkType
+		}
 	}
 
 	if len(cluster.TagSpecification) > 0 {