fixup: handle single value asset parameters

modules/core/log/farm_log.module

@@ -30,8 +30,17 @@ function farm_log_entity_prepare_form(EntityInterface $entity, $operation, FormS
   $query = \Drupal::request()->query;
 
   // Prepopulate the log asset field.
-  $asset_ids = $query->all('asset');
-  if (!empty($asset_ids)) {
+  if ($query->has('asset')) {
+
+    // Get asset IDs. We can't use $query->get('asset') or $query->all('asset')
+    // because those throw a client error if the parameter is not the expected
+    // cardinality (single value vs array of values).
+    $params = $query->all();
+    $asset_ids = $params['asset'];
+    if (!is_array($asset_ids)) {
+      $asset_ids = [$asset_ids];
+    }
+
     /** @var \Drupal\Core\Field\EntityReferenceFieldItemList $asset_field */
     $asset_field = $entity->get('asset');