Catch 404 if user leaves while roles are being added

[MarkKoz]

Sentry Issue: BOT-73

We really should go over the code and handle all 404s, not just for add_roles. It could be added to the command/event error handlers, but I'm not sure if that'd be too broad.

NotFound: 404 Not Found (error code: 10007): Unknown Member
  File "discord/ext/commands/core.py", line 85, in wrapped
    ret = await coro(*args, **kwargs)
  File "bot/cogs/verification.py", line 115, in accept_command
    await ctx.author.add_roles(Object(constants.Roles.verified), reason="Accepted the rules")
  File "discord/member.py", line 641, in add_roles
    await req(guild_id, user_id, role.id, reason=reason)
  File "discord/http.py", line 223, in request
    raise NotFound(r, data)

Error executing command invoked by <REDACTED>: !accept

[D0rs4n]

I believe it could be added to the command error handlers. This way it would catch the 404 errors that were not handled locally, hence it's not that broad.
(If this issue is still active, I would be glad to grab it!)

[Akarys42]

Hey @D0rs4n, thank you for your interest in this issue. Since this issue is about our old verification system before native gating, it isn't relevant anymore. This cog has been entirely removed.