Allow empty QU when editing product barcodes (fixes #2526)

changelog/77_UNRELEASED_xxxx-xx-xx.md

@@ -17,6 +17,7 @@
   - A plugin for [Open Food Facts](https://world.openfoodfacts.org/) is now included and used by default (see the `config.php` option `STOCK_BARCODE_LOOKUP_PLUGIN` and maybe change it as needed)
     - The product name and image (and of course the barcode itself) are taken over from Open Food Facts to the product being looked up
 - Optimized that when moving a product to a freezer location (so when freezing it) the due date will no longer be replaced when the product option "Default due days after freezing" is set to `0`
+- Fixed that a once set quantity unit on a product barcode could not be removed on edit
 
 ### Shopping list
 

public/viewjs/components/productamountpicker.js

@@ -8,6 +8,11 @@ Grocy.Components.ProductAmountPicker.Reload = function(productId, destinationQuI
 	if (!Grocy.Components.ProductAmountPicker.AllowAnyQuEnabled)
 	{
 		$("#qu_id").find("option").remove().end();
+		if (!$("#qu_id").hasAttr("required"))
+		{
+			$("#qu_id").append('<option></option>');
+		}
+
 		$("#qu_id").attr("data-destination-qu-name", FindObjectInArrayByPropertyValue(Grocy.QuantityUnits, 'id', destinationQuId).name);
 		$("#qu_id").attr("data-destination-qu-name-plural", FindObjectInArrayByPropertyValue(Grocy.QuantityUnits, 'id', destinationQuId).name_plural);
 
@@ -67,6 +72,11 @@ Grocy.Components.ProductAmountPicker.AllowAnyQu = function(keepInitialQu = false
 	Grocy.Components.ProductAmountPicker.AllowAnyQuEnabled = true;
 
 	$("#qu_id").find("option").remove().end();
+	if (!$("#qu_id").hasAttr("required"))
+	{
+		$("#qu_id").append('<option></option>');
+	}
+
 	Grocy.QuantityUnits.forEach(qu =>
 	{
 		$("#qu_id").append('<option value="' + qu.id + '" data-qu-factor="1" data-qu-name-plural="' + qu.name_plural + '">' + qu.name + '</option>');

public/viewjs/productbarcodeform.js

@@ -92,7 +92,11 @@ if (Grocy.EditMode == "edit")
 {
 	$("#display_amount").val(Grocy.EditObject.amount);
 	$(".input-group-productamountpicker").trigger("change");
-	Grocy.Components.ProductAmountPicker.SetQuantityUnit(Grocy.EditObject.qu_id);
+
+	if (Grocy.EditObject.qu_id)
+	{
+		Grocy.Components.ProductAmountPicker.SetQuantityUnit(Grocy.EditObject.qu_id);
+	}
 }
 
 Grocy.FrontendHelpers.ValidateForm('barcode-form');