Issue #2904847 by mglaman, vaplas: Replace debug() statements in Views

core/modules/views/src/Plugin/views/field/FieldPluginBase.php

@@ -185,7 +185,13 @@ abstract class FieldPluginBase extends HandlerBase implements FieldHandlerInterf
           }
 
           if (empty($table_alias)) {
-            debug(t('Handler @handler tried to add additional_field @identifier but @table could not be added!', ['@handler' => $this->definition['id'], '@identifier' => $identifier, '@table' => $info['table']]));
+            trigger_error(sprintf(
+              "Handler % tried to add additional_field %s but % could not be added!",
+              $this->definition['id'],
+              $identifier,
+              $info['table']
+            ), E_USER_WARNING);
+
             $this->aliases[$identifier] = 'broken';
             continue;
           }

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

@@ -56,8 +56,8 @@ class Opml extends StylePluginBase {
    */
   public function render() {
     if (empty($this->view->rowPlugin)) {
-      debug('Drupal\views\Plugin\views\style\Opml: Missing row plugin');
-      return;
+      trigger_error('Drupal\views\Plugin\views\style\Opml: Missing row plugin', E_WARNING);
+      return [];
     }
     $rows = [];
 

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

@@ -98,7 +98,7 @@ class Rss extends StylePluginBase {
 
   public function render() {
     if (empty($this->view->rowPlugin)) {
-      debug('Drupal\views\Plugin\views\style\Rss: Missing row plugin');
+      trigger_error('Drupal\views\Plugin\views\style\Rss: Missing row plugin', E_WARNING);
       return [];
     }
     $rows = [];

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

@@ -457,8 +457,8 @@ abstract class StylePluginBase extends PluginBase {
    */
   public function render() {
     if ($this->usesRowPlugin() && empty($this->view->rowPlugin)) {
-      debug('Drupal\views\Plugin\views\style\StylePluginBase: Missing row plugin');
-      return;
+      trigger_error('Drupal\views\Plugin\views\style\StylePluginBase: Missing row plugin', E_WARNING);
+      return [];
     }
 
     // Group the rows according to the grouping instructions, if specified.

core/modules/views/tests/src/Kernel/ModuleTest.php

@@ -28,7 +28,7 @@ class ModuleTest extends ViewsKernelTestBase {
   public static $modules = ['field', 'user', 'block'];
 
   /**
-   * Stores the last triggered error, for example via debug().
+   * Stores the last triggered error.
    *
    * @var string
    *