App Labels: empty parent label for is group fie;d

smart_service/masters/doctype/app_labels/app_labels.js

@@ -3,8 +3,8 @@
 
 
 frappe.ui.form.on('App Labels', {
-    is_group:  function(frm) {
-        if (frm.doc.is_group){
+    is_group: function (frm) {
+        if (frm.doc.is_group) {
             frm.set_value("language", "en");
             frm.set_df_property('language', 'read_only', 1);
             frm.set_df_property('label', 'read_only', 1);
@@ -16,12 +16,15 @@ frappe.ui.form.on('App Labels', {
             frm.set_df_property('parent_app_labels', 'hidden', 0);
         }
     },
-    english_label:  function(frm) {
-        if (frm.doc.is_group){
+    english_label: function (frm) {
+        if (frm.doc.is_group) {
             frm.set_value("label", frm.doc.english_label);
         }
     },
     validate: function (frm) {
+        if (frm.doc.is_group) {
+            frm.doc.parent_app_labels = null
+        }
         if (frm.doc.english_label) {
             if (frm.doc.english_label.length > 100) {
                 frappe.msgprint("<b>English Label :</b> Only <b> 50 </b> characters allowed")