"resource not found" behaviour in config

Author: Zlob

config/config.php

@@ -112,5 +112,19 @@
         }
     },
 
+    /*
+    |--------------------------------------------------------------------------
+    | 'Resource not found' function
+    |--------------------------------------------------------------------------
+    |
+    | Default behaviour in case 'resource not found'
+    |
+    */
+
+    'resourceNotFound' =>  function ()
+    {
+        return null;
+    },
+
 
 ];

src/JsonServer.php

@@ -92,7 +92,7 @@ public function GET()
         if ($result) {
             return $result->toArray();
         } else {
-            return null;
+            return call_user_func(Config::get('resourceNotFound'));
         }
     }