fix(ux): clean invalid fields from variant setting (frappe#27412)

erpnext/stock/doctype/item_variant_settings/item_variant_settings.js

@@ -2,19 +2,32 @@
 // For license information, please see license.txt
 
 frappe.ui.form.on('Item Variant Settings', {
-	setup: function(frm) {
+	refresh: function(frm) {
 		const allow_fields = [];
-		const exclude_fields = ["naming_series", "item_code", "item_name", "show_in_website",
-		"show_variant_in_website", "opening_stock", "variant_of", "valuation_rate"];
+
+		const existing_fields = frm.doc.fields.map(row => row.field_name);
+		const exclude_fields = [...existing_fields, "naming_series", "item_code", "item_name",
+			"show_in_website", "show_variant_in_website", "standard_rate", "opening_stock", "image",
+			"variant_of", "valuation_rate", "barcodes", "website_image", "thumbnail",
+			"website_specifiations", "web_long_description", "has_variants", "attributes"];
+
+		const exclude_field_types = ['HTML', 'Section Break', 'Column Break', 'Button', 'Read Only'];
 
 		frappe.model.with_doctype('Item', () => {
 			frappe.get_meta('Item').fields.forEach(d => {
-				if(!in_list(['HTML', 'Section Break', 'Column Break', 'Button', 'Read Only'], d.fieldtype)
+				if (!in_list(exclude_field_types, d.fieldtype)
 					&& !d.no_copy && !in_list(exclude_fields, d.fieldname)) {
 					allow_fields.push(d.fieldname);
 				}
 			});
 
+			if (allow_fields.length == 0) {
+				allow_fields.push({
+					label: __("No additional fields available"),
+					value: "",
+				});
+			}
+
 			frm.fields_dict.fields.grid.update_docfield_property(
 				'field_name', 'options', allow_fields
 			);