added check for islandora_hierarchical_access module

islandlives.module

@@ -55,6 +55,12 @@ function islandlives_entity_access(\Drupal\Core\Entity\EntityInterface $entity,
       return \Drupal\Core\Access\AccessResult::forbidden('Media is not published.');
     }
   }
+
+  $moduleHandler = \Drupal::service('module_handler');
+  if (!$moduleHandler->moduleExists('islandora_hierarchical_access')) {
+    return \Drupal\Core\Access\AccessResult::neutral();
+  }
+
   elseif ($entity instanceof \Drupal\file\FileInterface) {
     // Get all media attached to the files.
     $media = \Drupal::database()->select(\Drupal\islandora_hierarchical_access\LUTGeneratorInterface::TABLE_NAME, 'lut')