Merge remote-tracking branch 'origin/PWA-1720' into PWA-1655

Author: Prabhu Ram

app/code/Magento/CatalogGraphQl/DataProvider/Product/LayeredNavigation/Builder/Attribute.php

@@ -84,10 +84,10 @@ public function build(AggregationInterface $aggregation, ?int $storeId): array
                 $attribute['attribute_label'] ?? $bucketName,
                 \count($bucket->getValues()),
                 $attribute['attribute_code'] ?? $bucketName,
-                $attribute['position']
+                isset($attribute['position']) ? $attribute['position'] : null
             );
 
-            $options = $this->getSortedOptions($bucket, $attribute['options'] ?: []);
+            $options = $this->getSortedOptions($bucket, isset($attribute['options']) ? $attribute['options'] : []);
             foreach ($options as $option) {
                 $result[$bucketName]['options'][] = $this->layerFormatter->buildItem(
                     $option['label'],