Merge pull request #250 from coldic3/fix/facets-resolver-with-no-buckets

Fix FacetsResolver with no buckets

src/Api/Resolver/FacetsResolver.php

@@ -48,7 +48,7 @@ public function resolve(array $data): array
         }
 
         return array_filter($adapter->getAggregations(), function ($facet) {
-            return [] !== $facet['buckets'] ?? [];
+            return [] !== ($facet['buckets'] ?? []);
         });
     }
 }