[ConfigController] Fixed an exception on config load

Author: Eldar Gazaliev

Diff for: .gitignore

@@ -1,4 +1,5 @@
+composer.lock
+vendor
 
 /.php_cs.cache
 .idea
-

Diff for: src/Controller/ConfigController.php

@@ -262,11 +262,15 @@ public function getAction(Request $request): JsonResponse
         $name = $request->get('name');
 
         $configuration = Dao::getByName($name);
+
         if (empty($configuration)) {
             throw new Exception('Name does not exist.');
         }
 
-        if ($configuration && isset($configuration->configuration->general->executor)) {
+        if (
+            isset($configuration->configuration->general->executor) &&
+            class_exists($configuration->configuration->general->executor)
+        ) {
             /** @var $className IExecutor */
             $className = $configuration->configuration->general->executor;
             $cli = $className::getCli($name, null);