把 `ConversationHandler` 下的处理过程全部以堵塞方式运行
```
Traceback (most recent call last):
File "/home/luoshuijs/anaconda3/envs/TGPaimonBot/lib/python3.9/site-packages/python_telegram_bot-20.0a0-py3.9.egg/telegram/ext/_application.py", line 929, in process_update
check = handler.check_update(update) # Should the handler handle this update?
File "/home/luoshuijs/anaconda3/envs/TGPaimonBot/lib/python3.9/site-packages/python_telegram_bot-20.0a0-py3.9.egg/telegram/ext/_conversationhandler.py", line 741, in check_update
for candidate in self.states.get(state, []):
TypeError: unhashable type: 'PendingState'
```
目前改BUG已经提交给 `python-telegram-bot` 官方
很奇怪，先会这样
`Traceback (most recent call last):
File "/home/luoshuijs/anaconda3/envs/TGPaimonBot/lib/python3.9/site-packages/python_telegram_bot-20.0a0-py3.9.egg/telegram/ext/_application.py", line 874, in __create_task_callback
raise exception
File "/home/luoshuijs/anaconda3/envs/TGPaimonBot/lib/python3.9/site-packages/python_telegram_bot-20.0a0-py3.9.egg/telegram/ext/_application.py", line 846, in __create_task_callback
return await coroutine
File "/home/luoshuijs/anaconda3/envs/TGPaimonBot/lib/python3.9/site-packages/python_telegram_bot-20.0a0-py3.9.egg/telegram/ext/_handler.py", line 137, in handle_update
return await self.callback(update, context)
File "/root/Projects/TGPaimonBot/plugins/base.py", line 66, in decorator
return await func(*args, **kwargs)
File "/root/Projects/TGPaimonBot/plugins/quiz.py", line 95, in command_start
poll_message = await self.send_poll(update)
File "/root/Projects/TGPaimonBot/plugins/quiz.py", line 66, in send_poll
index = options.index(correct_option)
ValueError: '' is not in list`
然后就会一直这样
`Traceback (most recent call last):
File "/home/luoshuijs/anaconda3/envs/TGPaimonBot/lib/python3.9/site-packages/python_telegram_bot-20.0a0-py3.9.egg/telegram/ext/_application.py", line 929, in process_update
check = handler.check_update(update) # Should the handler handle this update?
File "/home/luoshuijs/anaconda3/envs/TGPaimonBot/lib/python3.9/site-packages/python_telegram_bot-20.0a0-py3.9.egg/telegram/ext/_conversationhandler.py", line 741, in check_update
for candidate in self.states.get(state, []):
TypeError: unhashable type: 'PendingState'`
但是对于上个错误一直触发我也没办法
