Check null value in getStringCustomAttributes()

If $attributes value is null, we convert to empty array to prevent that loop causes Exception.

Author: jlnarvaez

app/code/Magento/Catalog/Block/Product/ImageFactory.php

@@ -76,6 +76,7 @@ public function __construct(
     private function getStringCustomAttributes(array $attributes): string
     {
         $result = [];
+        $attributes = (is_null($attributes)) ? [] : $attributes;
         foreach ($attributes as $name => $value) {
             if ($name != 'class') {
                 $result[] = $name . '="' . $value . '"';
@@ -131,10 +132,10 @@ private function getLabel(Product $product, string $imageType): string
      *
      * @param Product $product
      * @param string $imageId
-     * @param array $attributes
+     * @param array|null $attributes
      * @return ImageBlock
      */
-    public function create(Product $product, string $imageId, array $attributes = []): ImageBlock
+    public function create(Product $product, string $imageId, array $attributes = null): ImageBlock
     {
         $viewImageConfig = $this->presentationConfig->getViewConfig()->getMediaAttributes(
             'Magento_Catalog',