Fix null pointer exception

public/typo3conf/ext/ep_theme/Resources/Private/Assets/js/controllers/product_details_controller.js

@@ -70,12 +70,14 @@ export default class extends Controller {
         this.loadingValue = true
         this.priceTableContainerTarget.innerHTML = ''
         this.modeValue = 'prices'
-        let paCode = this.getConfig().paCode
         let dateUid = e.currentTarget.dataset.dateUid
         const data = new URLSearchParams({
             'tx_epproducts_ajax[date]': dateUid,
-            'tx_epproducts_ajax[paCode]': paCode,
         })
+        let paCode = this.getConfig().paCode
+        if (paCode) {
+            data.append('tx_epproducts_ajax[paCode]', paCode)
+        }
         fetch(this.pricetableUriValue, { method: 'POST', body: data })
             .then(this.checkStatus)
             .then(this.parseHTML)