fix(php): fix php warning when checking view_mode validity

token_entity_render.module

@@ -72,16 +72,17 @@ function token_entity_render_tokens($type, array $tokens, array $data, array $op
   // Traverse again all tokens to process.
   $renderer = \Drupal::service('renderer');
   foreach ($to_process as $token_replaceable_value => $view_mode_name) {
+    $target_view_mode = $data['entity_type'] . '.' . $view_mode_name;
     // If the view mode actually exists and if the entity type matches.
-    if (($view_mode = $all_view_modes[$data['entity_type'] . '.' . $view_mode_name])) {
-      // The view mode name does not have the entity name.
-      $mode_machine_name = substr($view_mode->id(), strlen($view_mode->getTargetType()) + 1);
-
-      $rendered_entity = \Drupal::entityTypeManager()->getViewBuilder($view_mode->getTargetType())->view($data['entity'], $mode_machine_name);
-
-      // Add the replacement.
-      $replacements[$token_replaceable_value] = $renderer->renderPlain($rendered_entity);
+    if (!isset($all_view_modes[$target_view_mode])) {
+      continue;
     }
+    $view_mode = $all_view_modes[$target_view_mode];
+    // The view mode name does not have the entity name.
+    $mode_machine_name = substr($view_mode->id(), strlen($view_mode->getTargetType()) + 1);
+    $rendered_entity = \Drupal::entityTypeManager()->getViewBuilder($view_mode->getTargetType())->view($data['entity'], $mode_machine_name);
+    // Add the replacement.
+    $replacements[$token_replaceable_value] = $renderer->renderPlain($rendered_entity);
   }
 
   // Return replacements, if any.