char_lookup failing on zKill keys

[evidex]

requested character info for the user Pech Tor
 [15/06/2018 08:34:40] ERROR events on_command_error 100: CommandInvokeError
 Traceback (most recent call last):
   File "/firetail/firetail/extensions/char_lookup/char_lookup.py", line 75, in _char
     danger_ratio = zkill_stats['dangerRatio']
 KeyError: 'dangerRatio'

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):
   File "/usr/local/lib/python3.6/site-packages/discord/ext/commands/core.py", line 60, in wrapped
     ret = await coro(*args, **kwargs)
   File "/firetail/firetail/extensions/char_lookup/char_lookup.py", line 165, in _char
     await ctx.message.delete()
   File "/usr/local/lib/python3.6/site-packages/discord/message.py", line 545, in delete
     await self._state.http.delete_message(self.channel.id, self.id)
   File "/usr/local/lib/python3.6/site-packages/discord/http.py", line 210, in request
     raise Forbidden(r, data)
 discord.errors.Forbidden: FORBIDDEN (status code: 403): Missing Permissions

char_lookup extension needs to guard more against zKill returning out of spec results. Command also seems to take quite long to process, and occasionally produces double output. I'll look into submitting a PR to correct this.

[shibdib]

char lookup is slow, I need to debug it a bit and figure out where the slowdown is occuring.