refactoring

Author: Nazar65

app/code/Magento/CatalogSearch/Model/Layer/Filter/Decimal.php

@@ -111,12 +111,9 @@ protected function _getItemsData()
                 $from = '';
             }
             if ($to == '*') {
-                $to = '';
+                $to = null;
             }
-            $label = $this->renderRangeLabel(
-                empty($from) ? 0 : $from,
-                empty($to) ? $to : $to
-            );
+            $label = $this->renderRangeLabel(empty($from) ? 0 : $from, $to);
             $value = $from . '-' . $to;
 
             $data[] = [
@@ -141,7 +138,7 @@ protected function _getItemsData()
     protected function renderRangeLabel($fromPrice, $toPrice)
     {
         $formattedFromPrice = $this->priceCurrency->format($fromPrice);
-        if ($toPrice === '') {
+        if ($toPrice === null) {
             return __('%1 and above', $formattedFromPrice);
         } else {
             if ($fromPrice != $toPrice) {