B2B-2677: [MediaGallery]Implement data caching for GraphQL results on resolver level

- Remove condition that is always false

Author: danmooney2

app/code/Magento/GraphQlResolverCache/Model/Resolver/Result/ValueProcessor.php

@@ -134,9 +134,6 @@ public function preProcessParentValue(array &$value): void
      */
     private function hydrateData(array &$value)
     {
-        if ($value === null) {
-            return;
-        }
         // the parent value is always a single object that contains currently resolved value
         $reference = $this->defaultFlagGetter->getFlagFromValue($value) ?? null;
         if (isset($reference['cacheKey']) && isset($reference['index'])) {