Add UnsupportedLanguage exception

Signed-off-by: Olivier Gayot <olivier.gayot@sigexec.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/swiftstory/GameManager.py b/swiftstory/GameManager.py
index a7098bc..52ce554 100644
--- a/swiftstory/GameManager.py
+++ b/swiftstory/GameManager.py
@@ -1,6 +1,7 @@
 import logging
 import os
 
+from swiftstory.exception import UnsupportedLanguage
 from swiftstory.Game import Game
 from swiftstory.Cards import Cards
 
@@ -20,7 +21,7 @@ class GameManager:
 
     def join_game(self, game_name, lang):
         if self.langs.get(lang) is None:
-            return None
+            raise UnsupportedLanguage(lang)
 
         games = self.langs[lang]['games']
         black_cards = self.langs[lang]['black_cards']