Bug fix for zero quantity pricing (#4766)

- Fix default value for formatPriceRange method
- Display empty value in table

(cherry picked from commit 07d9c2264e)

InvenTree/templates/js/translated/pricing.js

@@ -76,7 +76,11 @@ function formatPriceRange(price_min, price_max, options={}) {
     var p_min = price_min || price_max;
     var p_max = price_max || price_min;
 
-    var quantity = options.quantity || 1;
+    var quantity = 1;
+
+    if ('quantity' in options) {
+        quantity = options.quantity;
+    }
 
     if (p_min == null && p_max == null) {
         return null;

InvenTree/templates/js/translated/stock.js

@@ -2063,6 +2063,10 @@ function loadStockTable(table, options) {
                 currency = baseCurrency();
             }
 
+            if (row.quantity <= 0) {
+                return '-';
+            }
+
             return formatPriceRange(
                 min_price,
                 max_price,