3256091: Warning: array_flip fix

core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php

@@ -663,7 +663,7 @@ public function loadMultipleRevisions(array $revision_ids) {
 
     // Ensure that the returned array is ordered the same as the original
     // $ids array if this was passed in and remove any invalid IDs.
-    if ($revision_ids) {
+    if (!empty($revision_ids)) {
       $flipped_ids = array_intersect_key(array_flip($revision_ids), $revisions);
       $revisions = array_replace($flipped_ids, $revisions);
     }