Fixed wrong default values

src/Appwrite/Utopia/Response/Model/Execution.php

@@ -61,7 +61,7 @@ class Execution extends Model
             ->addRule('time', [
                 'type' => self::TYPE_FLOAT,
                 'description' => 'The script execution time in seconds.',
-                'default' => '',
+                'default' => 0,
                 'example' => 0.400,
             ])
         ;

src/Appwrite/Utopia/Response/Model/File.php

@@ -19,7 +19,7 @@ class File extends Model
             ->addRule('$permissions', [
                 'type' => Response::MODEL_PERMISSIONS,
                 'description' => 'File permissions.',
-                'default' => '',
+                'default' => new \stdClass,
                 'example' => new \stdClass,
                 'array' => false,
             ])