if plugin manager is not set, throw an exception with possible reasons

Author: n3vrax

src/AbstractController.php

@@ -10,6 +10,7 @@
 namespace Dot\Controller;
 
 use Dot\Controller\Event\DispatchControllerEventsTrait;
+use Dot\Controller\Exception\RuntimeException;
 use Dot\Controller\Plugin\PluginInterface;
 use Dot\Controller\Plugin\PluginManager;
 use Dot\Controller\Plugin\PluginManagerAwareInterface;
@@ -122,7 +123,8 @@ public function plugin(string $name, array $options = []): PluginInterface
     public function getPluginManager(): PluginManager
     {
         if (!$this->pluginManager) {
-            $this->pluginManager = new PluginManager(new ServiceManager(), []);
+            throw new RuntimeException('Controller plugin manager not set. Enable the controller module by merging' .
+                'its ConfigProvider and make sure the controller is registered in the service manager');
         }
         return $this->pluginManager;
     }