Merge pull request 'fix' (#9) from master into dev

Reviewed-on: https://gitea.sprinthub.ru/self/roulette-bot/pulls/9

bot.py

@@ -64,7 +64,7 @@ class Core(TasksHandlerMixin):
         self.send_message('🤖 Поиски собеседника продолжаются')
 
     def send_message(self, text, chat_id=None, reply_markup=None, remove_keyboard=True):
-        if text is None:
+        if not text:
             return
         if reply_markup is None and remove_keyboard:
             reply_markup = ReplyKeyboardRemove()