Fix JS error on cart configure page for configurable products

Author: ihor-sviziev

app/code/Magento/Msrp/view/base/web/js/msrp.js

@@ -352,8 +352,11 @@ define([
             $(this.options.mapInfoLinks).show();
 
             if (useDefaultPrice || !this.wasOpened) {
-                this.$popup.find(this.options.msrpLabelId).html(options.msrpPrice);
-                this.$popup.find(this.options.priceLabelId).html(options.realPrice);
+                if (this.$popup) {
+                    this.$popup.find(this.options.msrpLabelId).html(options.msrpPrice);
+                    this.$popup.find(this.options.priceLabelId).html(options.realPrice);
+                }
+
                 $(this.options.displayPriceElement).html(msrpPrice);
                 this.wasOpened = true;
             }