Other bot integration kills slackbot on message processing.

[plainenough]

01-21 18:25 asyncio ERROR Task exception was never retrieved
future: <Task finished coro=<RTMClient._connect_and_read() done, defined at /usr/local/lib/python3.6/dist-packages/slack/rtm/client.py:307> exception=AttributeError("'Message' object has no attribute 'command'",)>
Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/slack/rtm/client.py", line 339, in _connect_and_read
await self._read_messages()
File "/usr/local/lib/python3.6/dist-packages/slack/rtm/client.py", line 390, in _read_messages
await self._dispatch_event(event, data=payload)
File "/usr/local/lib/python3.6/dist-packages/slack/rtm/client.py", line 440, in _dispatch_event
self._execute_in_thread(callback, data)
File "/usr/local/lib/python3.6/dist-packages/slack/rtm/client.py", line 465, in _execute_in_thread
future.result()
File "/usr/lib/python3.6/concurrent/futures/_base.py", line 425, in result
return self.__get_result()
File "/usr/lib/python3.6/concurrent/futures/_base.py", line 384, in __get_result
raise self._exception
File "/usr/lib/python3.6/concurrent/futures/thread.py", line 56, in run
result = self.fn(*self.args, **self.kwargs)
File "/opt/slackbot/main.py", line 43, in catch_message
message = Message(data, **kwargs)
File "/opt/slackbot/message.py", line 42, in init
self.run_command()
File "/opt/slackbot/message.py", line 130, in run_command
if self.command:
AttributeError: 'Message' object has no attribute 'command'
01-21 18:25 root ERROR A worker died. So should I. :(

[plainenough]

Fixed.