fix 500 happening in error pages (#914)

src/Event/ThemeEvent.php

@@ -23,7 +23,7 @@ final class ThemeEvent extends Event
     public const CONTENT_AFTER = 'app.theme.content_after';
 
     /**
-     * @var User
+     * @var User|null
      */
     protected $user;
     /**
@@ -35,33 +35,28 @@ final class ThemeEvent extends Event
      */
     protected $payload = null;
 
-    public function __construct(User $user, $payload = null)
+    public function __construct(?User $user = null, $payload = null)
     {
         $this->user = $user;
         $this->payload = $payload;
     }
 
     /**
-     * @return User
+     * @deprecated since 1.0
      */
-    public function getUser()
+    public function getUser(): ?User
     {
+        @trigger_error('Using ThemeEvent::getUser() is deprecated and will be removed with 2.0', E_USER_DEPRECATED);
+
         return $this->user;
     }
 
-    /**
-     * @return string
-     */
     public function getContent(): string
     {
         return $this->content;
     }
 
-    /**
-     * @param string $content
-     * @return ThemeEvent
-     */
-    public function addContent(string $content)
+    public function addContent(string $content): ThemeEvent
     {
         $this->content .= $content;
 

templates/bundles/TwigBundle/Exception/error500.html.twig

@@ -1,10 +1,7 @@
-{#
-    This template is used to render errors of type HTTP 500 (Internal Server Error)
+{% extends 'error.html.twig' %}
 
-    This is the simplest way to customize error pages in Symfony applications.
-    In case you need it, you can also hook into the internal exception handling
-    made by Symfony. This allows you to perform advanced tasks and even recover
-    your application from some errors.
-    See http://symfony.com/doc/current/cookbook/controller/error_pages.html
-#}
-{% extends '@Twig/Exception/error.html.twig' %}
+{% block error_icon %}
+    <i class="fas fa-bug text-red"></i>
+{% endblock %}
+
+{% block error_class %}text-red{% endblock %}

templates/error.html.twig

@@ -19,7 +19,7 @@
     {% endif %}
 
     <div class="error-page">
-        <h2 class="headline text-yellow"> {{ status_code }}</h2>
+        <h2 class="headline {% block error_class %}text-yellow{% endblock %}"> {{ status_code }}</h2>
 
         {% block error_content %}
         <div class="error-content">