Fix ConversationHandler.check_update not respecting per_user (#3128)

telegram/ext/_conversationhandler.py

@@ -693,6 +693,8 @@ class ConversationHandler(BaseHandler[Update, CCT]):
             return None
         if self.per_chat and not update.effective_chat:
             return None
+        if self.per_user and not update.effective_user:
+            return None
         if self.per_message and not update.callback_query:
             return None
         if update.callback_query and self.per_chat and not update.callback_query.message:

tests/test_conversationhandler.py

@@ -740,6 +740,12 @@ class TestConversationHandler:
             ],
             bot=bot,
         )
+
+        # First check that updates without user won't be handled
+        message.from_user = None
+        assert not handler.check_update(Update(update_id=0, message=message))
+
+        message.from_user = user1
         async with app:
             await app.process_update(Update(update_id=0, message=message))