Bug: Preview fails when Hydrus service uninitialized

2023-05-04 20:00:57 discord.client       DEBUG    Dispatching event presence_update
Ignoring exception in on_previewable
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/discord/client.py", line 377, in _run_event
    await coro(*args, **kwargs)
  File "/usr/src/cables/cabling_bot/events/message_media_expand.py", line 288, in handle_message
    self.hydrus_enabled()
  File "/usr/src/cables/cabling_bot/events/message_media_expand.py", line 81, in hydrus_enabled
    return bool(self._bot.hydrus.client)
AttributeError: 'NoneType' object has no attribute 'client'