[MIRROR] vending fix (#11466)

Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>

code/modules/economy/vending.dm

@@ -544,6 +544,8 @@ GLOBAL_LIST_EMPTY(vending_products)
 		flick("[icon_state]-deny",src)
 		playsound(src, 'sound/machines/deniedbeep.ogg', 50, 0)
 		return FALSE
+	if(R.amount < 1)
+		return FALSE
 	return TRUE
 
 /obj/machinery/vending/proc/vend(datum/stored_item/vending_product/R, mob/user)

tgui/packages/tgui/interfaces/Vending.tsx

@@ -158,6 +158,7 @@ export const VendingProductsGrid = (props: { products: product[] }) => {
         <ImageButton
           key={product.key}
           asset={product.isatom ? ['vending32x32', product.path] : undefined}
+          disabled={!product.amount}
           tooltip={`${capitalizeAll(product.name)}${product.desc ? ` - ${product.desc}` : ''}`}
           tooltipPosition="bottom-end"
           buttonsAlt={