Fix crash when no last playing data is found

[luissilva1044894]

Fixes #18

[malmeloo]

Did you test this? I don't think it should make a difference:

>>> {}.get('empty', {})
{}
>>> {}.get('empty') or {}
{}

I'm honestly not even sure how the last_played var could be None

[luissilva1044894]

Ofc it does! API returns null for last_played where code expects to be {}:

{
  "user":{
    "name":"DISCORDTAG",
    "id":"DISCORDID"
  },
  "tag_url":{
    "normal":"https://tag.rc24.xyz/DISCORDID/tag.png",
    "max":"https://tag.rc24.xyz/DISCORDID/tag.max.png"
  },
  "game_data":{
    "last_played":null,
    "games":[]
  }
}

[malmeloo]

Oh I see! I think this might be a minor inconsistency with v1.0, I thought the key would simply be missing instead.

Thanks for the PR :)