fix(emr): [122438029]handle error when the element in pre_executed_file_settings is nil (#3219)

* handle error when the element in pre_executed_file_settings is nil

* add changelog

---------

Co-authored-by: mikatong <mikatong@tencent.com>

Author: tongyiming

.changelog/3219.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/tencentcloud_emr_cluster: handle error when the element in pre_executed_file_settings is nil
+```

tencentcloud/services/emr/service_tencentcloud_emr.go

@@ -248,7 +248,11 @@ func (me *EMRService) CreateInstance(ctx context.Context, d *schema.ResourceData
 
 	if v, ok := d.GetOk("pre_executed_file_settings"); ok {
 		preExecutedFileSettings := v.([]interface{})
-		for _, preExecutedFileSetting := range preExecutedFileSettings {
+		for idx, preExecutedFileSetting := range preExecutedFileSettings {
+			if preExecutedFileSetting == nil {
+				err = fmt.Errorf("pre_executed_file_settings element with index %d is nil", idx+1)
+				return
+			}
 			preExecutedFileSettingMap := preExecutedFileSetting.(map[string]interface{})
 			tmpPreExecutedFileSetting := &emr.PreExecuteFileSettings{}
 			if v, ok := preExecutedFileSettingMap["args"]; ok {