`/creatures` → `creature_list` containing creature with whitespace name

[mathiasbynens]

The creature_list of https://api.tibiadata.com/v4/creatures includes a creature with a name that’s just four spaces:

     {
        "name": "    ",
        "race": "zombie",
        "image_url": "https://static.tibia.com/images/library/zombie.gif",
        "featured": false
      },

[mathiasbynens]

This is #400.