From 78a1bd3cebaca2b525c1ef62cb6c05181da28521 Mon Sep 17 00:00:00 2001
From: Alexander Tikhonov <fatal1ty.rnd@gmail.com>
Date: Sun, 31 Mar 2024 15:45:55 +0300
Subject: [PATCH] Fix the code to satisfy mypy

---
 mashumaro/core/meta/code/builder.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mashumaro/core/meta/code/builder.py b/mashumaro/core/meta/code/builder.py
index 17508d3f..deceedd0 100644
--- a/mashumaro/core/meta/code/builder.py
+++ b/mashumaro/core/meta/code/builder.py
@@ -627,13 +627,14 @@ def get_discriminator(
         if look_in_parents:
             classes = self.cls.__mro__
         else:
-            classes = [self.cls]
+            classes = (self.cls,)
         for cls in classes:
             discriminator = self.get_config(
                 cls, look_in_parents=False
             ).discriminator
             if discriminator:
                 return discriminator
+        return None
 
     def get_pack_method_flags(
         self,