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@@ -369,7 +369,9 @@ class Bot(TelegramBot, ObjectWithDatabase):
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message = self._unknown_command_message
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else:
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message = self.__class__._unknown_command_message
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- return message.format(bot=self)
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+ if message is not None:
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+ message = message.format(bot=self)
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+ return message
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@property
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def callback_data_separator(self):
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