Issue #3266243 by mfb, longwave, catch: Views tries to call trigger_error()...

Issue #3266243 by mfb, longwave, catch: Views tries to call trigger_error() with E_WARNING which throws a ValueError

core/modules/views/src/Plugin/views/style/Opml.php

@@ -55,10 +55,6 @@ public function attachTo(array &$build, $display_id, Url $feed_url, $title) {
    * {@inheritdoc}
    */
   public function render() {
-    if (empty($this->view->rowPlugin)) {
-      trigger_error('Drupal\views\Plugin\views\style\Opml: Missing row plugin', E_WARNING);
-      return [];
-    }
     $rows = [];
 
     foreach ($this->view->result as $row_index => $row) {

core/modules/views/src/Plugin/views/style/Rss.php

@@ -107,10 +107,6 @@ public function getDescription() {
   }
 
   public function render() {
-    if (empty($this->view->rowPlugin)) {
-      trigger_error('Drupal\views\Plugin\views\style\Rss: Missing row plugin', E_WARNING);
-      return [];
-    }
     $rows = [];
 
     // This will be filled in by the row plugin and is used later on in the

core/modules/views/src/Plugin/views/style/StylePluginBase.php

@@ -444,11 +444,6 @@ protected function renderRowGroup(array $rows = []) {
    * Render the display in this style.
    */
   public function render() {
-    if ($this->usesRowPlugin() && empty($this->view->rowPlugin)) {
-      trigger_error('Drupal\views\Plugin\views\style\StylePluginBase: Missing row plugin', E_WARNING);
-      return [];
-    }
-
     // Group the rows according to the grouping instructions, if specified.
     $sets = $this->renderGrouping(
       $this->view->result,