From b6f0893c336a575b9658b530eb89972b05abb8ff Mon Sep 17 00:00:00 2001
From: epenet <6771947+epenet@users.noreply.github.com>
Date: Tue, 30 Jul 2024 13:05:38 +0200
Subject: [PATCH] Fix implicit-return in denon (#122835)

---
 homeassistant/components/denon/media_player.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/homeassistant/components/denon/media_player.py b/homeassistant/components/denon/media_player.py
index b3b3ba97baa..0a6fe18d986 100644
--- a/homeassistant/components/denon/media_player.py
+++ b/homeassistant/components/denon/media_player.py
@@ -253,11 +253,12 @@ class DenonDevice(MediaPlayerEntity):
         return SUPPORT_DENON
 
     @property
-    def source(self):
+    def source(self) -> str | None:
         """Return the current input source."""
         for pretty_name, name in self._source_list.items():
             if self._mediasource == name:
                 return pretty_name
+        return None
 
     def turn_off(self) -> None:
         """Turn off media player."""