Fix indexing issue when no product variant is found

Author: shochdoerfer

src/Indexer/AbstractIndexer.php

@@ -63,6 +63,10 @@ public function reindex(array $documentIdsToReindex = []): void
                     $bulk = [];
                     /** @var array $document */
                     foreach ($this->getDocumentsToIndex($channel, $locale, $documentIdsToReindex) as $document) {
+                        if (0 === \count($document)) {
+                            continue;
+                        }
+                        /* @phpstan-ignore-next-line */
                         $bulk[$document['id']] = json_encode($document);
                         if (\count($bulk) >= $batchSize) {
                             $this->indexOperation->executeBulk($index, $bulk);

src/Indexer/ProductIndexer.php

@@ -90,8 +90,11 @@ public function getDocumentsToIndex(
     private function formatProduct(ProductInterface $product, ChannelInterface $channel, LocaleInterface $locale): array
     {
         $variants = $product->getVariants();
-        /** @var ProductVariantInterface $variant */
+        /** @var ProductVariantInterface|false $variant */
         $variant = $variants->first();
+        if (false === $variant) {
+            return [];
+        }
 
         /** @var int|string $productId */
         $productId = $product->getId();