DM score check raises an error

[dudeofawesome]

DM to bot with message "/myvirginity" leads to this error in console:

Ignoring exception in command myvirginity:
Traceback (most recent call last):
  File "/home/virginitybot/.local/lib/python3.8/site-packages/discord/ext/commands/core.py", line 83, in wrapped
    ret = await coro(*args, **kwargs)
  File "/home/virginitybot/bot.py", line 87, in myvirginity
    virgin = Virgin.get(guild_id=str(ctx.message.guild.id),
AttributeError: 'NoneType' object has no attribute 'id'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/virginitybot/.local/lib/python3.8/site-packages/discord/ext/commands/bot.py", line 892, in invoke
    await ctx.command.invoke(ctx)
  File "/home/virginitybot/.local/lib/python3.8/site-packages/discord/ext/commands/core.py", line 797, in invoke
    await injected(*ctx.args, **ctx.kwargs)
  File "/home/virginitybot/.local/lib/python3.8/site-packages/discord/ext/commands/core.py", line 92, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: AttributeError: 'NoneType' object has no attribute 'id'

Not sure what the expected behavior here should be though, since we can't really tell what server the user is asking for the score on. Maybe we send a message asking the user what server?