Feature: [docgen] create a service to generate a document from a template

src/Bundle/ChillDocGeneratorBundle/Service/Generator/RelatedEntityNotFoundException.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Chill\DocGeneratorBundle\Service\Generator;
+
+class RelatedEntityNotFoundException extends \RuntimeException
+{
+    public function __construct(string $relatedEntityClass, int $relatedEntityId, Throwable $previous = null)
+    {
+        parent::__construct(
+            sprintf("Related entity not found: %s, %s", $relatedEntityClass, $relatedEntityId),
+            99876652,
+            $previous);
+    }
+}