频道补丁功能导致抽卡功能异常

虽然也看到别人有成功运行的例子，但是我真的没搞明白（抽卡功能会报异常，无论是在群消息里还是频道里调用均会。异常信息：（群）
11-23 19:20:56 [DEBUG] nonebot | CQHTTP | User is calling me 派蒙
11-23 19:20:56 [SUCCESS] nonebot | CQHTTP 3125556909 | [message.group.normal]: Message -307893237 from 530317214@[群:88888888] "相遇之缘"
11-23 19:20:56 [DEBUG] nonebot | Checking for matchers in priority 1...
11-23 19:20:56 [INFO] nonebot | Event will be handled by <Matcher from gacha, type=message, priority=1, temp=False>
11-23 19:20:56 [DEBUG] nonebot | Running matcher <Matcher from gacha, type=message, priority=1, temp=False>
11-23 19:20:56 [DEBUG] nonebot | Running handler <Handler _strip_cmd(bot: Bot, event: Event, state: typing.Dict[typing.Any, typing.Any], matcher: None)>
11-23 19:20:56 [DEBUG] nonebot | Running handler <Handler gacha_10_(bot: <class 'nonebot.adapters._bot.Bot'>, event: <class 'nonebot.adapters._event.Event'>, state: None, matcher: None)>
11-23 19:20:56 [INFO] nonebot | Matcher <Matcher from gacha, type=message, priority=1, temp=False> running complete
11-23 19:20:56 [ERROR] nonebot | Running matcher <Matcher from gacha, type=message, priority=1, temp=False> failed.
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.8/multiprocessing/spawn.py", line 116, in spawn_main
    exitcode = _main(fd, parent_sentinel)
  File "/usr/lib/python3.8/multiprocessing/spawn.py", line 129, in _main
    return self._bootstrap(parent_sentinel)
  File "/usr/lib/python3.8/multiprocessing/process.py", line 315, in _bootstrap
    self.run()
  File "/usr/lib/python3.8/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/lib/python3.8/dist-packages/uvicorn/subprocess.py", line 76, in subprocess_started
    target(sockets=sockets)
  File "/usr/local/lib/python3.8/dist-packages/uvicorn/server.py", line 68, in run
    return asyncio.run(self.serve(sockets=sockets))
  File "/usr/lib/python3.8/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/usr/local/lib/python3.8/dist-packages/nonebot/message.py", line 128, in _check_matcher
    await _run_matcher(Matcher, bot, event, state)
> File "/usr/local/lib/python3.8/dist-packages/nonebot/message.py", line 156, in _run_matcher
    await matcher.run(bot, event, state)
  File "/usr/local/lib/python3.8/dist-packages/nonebot/matcher.py", line 597, in run
    await handler(self, bot, event, self.state)
  File "/usr/local/lib/python3.8/dist-packages/nonebot/handler.py", line 64, in __call__
    await self.func(
  File "/root/GS_bot/Genshin_Impact_bot/gacha/__init__.py", line 51, in gacha_10_
    await gacha_10.finish(Message(G.gacha_10()) , at_sender=True)
  File "/root/GS_bot/Genshin_Impact_bot/gacha/gacha.py", line 286, in gacha_10
    new_gacha = self.gacha_one()
  File "/root/GS_bot/Genshin_Impact_bot/gacha/gacha.py", line 274, in gacha_one
    return random.choice(POOL[self.pool]['3_star_not_UP'])
  File "/usr/lib/python3.8/random.py", line 290, in choice
    raise IndexError('Cannot choose from an empty sequence') from None
IndexError: Cannot choose from an empty sequence
11-23 19:20:56 [DEBUG] nonebot | Stop event propagation
H-K-Y / Genshin_Impact_bot

频道补丁功能导致抽卡功能异常 #72
