title: How to exclude a role in discord.py
body: <p>So I have an Emergency command incase there is something and I have to DM every one but there is a problem with the bots as DMing them causes an error (the bots role is "BOTS") </p>
  
  <pre><code>@bot.command(pass_context=True)
  async def emergency(ctx, *, message: str):
      if admin in [role.id for role in ctx.message.author.roles]:
          for server_member in ctx.message.server.members:
              await bot.send_message(server_member, message)
      else:
          await bot.say("DENIED, You do not have permission to use this command")
  </code></pre>
  
  <p>and the Error</p>
  
  <pre><code>Traceback (most recent call last):
    File "C:\Users\adamk\PycharmProjects\bot\venv\lib\site-packages\discord\ext\commands\bot.py", line 846, in process_commands
      yield from command.invoke(ctx)
    File "C:\Users\adamk\PycharmProjects\bot\venv\lib\site-packages\discord\ext\commands\core.py", line 374, in invoke
      yield from injected(*ctx.args, **ctx.kwargs)
    File "C:\Users\adamk\PycharmProjects\bot\venv\lib\site-packages\discord\ext\commands\core.py", line 54, in wrapped
      raise CommandInvokeError(e) from e
  discord.ext.commands.errors.CommandInvokeError: Command raised an exception: Forbidden: FORBIDDEN (status code: 403): Cannot send messages to this user
  </code></pre>