Фикс отсутствия EventDispatcher.

Author: ProklUng

config/base.yaml

@@ -14,6 +14,12 @@ services:
   Symfony\Component\HttpKernel\KernelInterface: '@kernel'
   Symfony\Component\HttpKernel\Kernel: '@kernel'
 
+  event_dispatcher:
+    class: Symfony\Component\EventDispatcher\EventDispatcher
+
+  Symfony\Component\EventDispatcher\EventDispatcher: '@event_dispatcher'
+  Symfony\Contracts\EventDispatcher\EventDispatcherInterface: '@event_dispatcher'
+
   # Параметры приложения.
   parameter_bag:
     class: Symfony\Component\DependencyInjection\ParameterBag\ContainerBag