title: Strange JSON keyerror python 3
body: <p>I have been getting some strange key errors when trying to load a value after a few game ticks in my case, there is no modification going on cause most of it gets loaded from class internally at initiation, here is an quick example of the error im getting when trying to access.
  also link to source is <a href="https://github.com/boedaka/RPG_engine_python" rel="nofollow noreferrer">here</a>, im pretty new and just have been coding for aint to long so please no judgement. </p>
  
  <pre><code>{'calleas': {'player': {'x': 5, 'y': 5, 'id': 'npc_1'}, '1': {'x': 6, 'y': 8, 'id': 'npc_2'}, '2': {'x': 5, 'y': 8, 'id': 'npc_3'}}, 'calleas_forest': {'player': {'x': 55, 'y': 5, 'id': 'npc_1'}}}
  {'calleas': {'0': {'object_id': 7, 'x': 0, 'y': 5, 'walkable': True, 'gamestate': 'callaes_forest'}, '1': {'object_id': 7, 'x': 0, 'y': 4, 'walkable': True, 'gamestate': 'callaes_forest'}}, 'callaes_forest': {'0': {'object_id': 7, 'x': 56, 'y': 5, 'walkable': True, 'gamestate': 'callaes_forest'}, '1': {'object_id': 7, 'x': 56, 'y': 4, 'walkable': True, 'gamestate': 'callaes_forest'}}}
  None
  Traceback (most recent call last):
    File "C:/Users/Jannick/PycharmProjects/NewRemake/Game.py", line 39, in &lt;module&gt;
      g.start_game()
    File "C:/Users/Jannick/PycharmProjects/NewRemake/Game.py", line 33, in start_game
      self.update()
    File "C:\Users\Jannick\PycharmProjects\NewRemake\GameHandler.py", line 106, in update
      self.entity_handler.update()
    File "C:\Users\Jannick\PycharmProjects\NewRemake\Entity\EntityHandler.py", line 21, in update
      self.game.player.update()
    File "C:\Users\Jannick\PycharmProjects\NewRemake\Entity\Entity.py", line 35, in update
      self.move(x=1)
    File "C:\Users\Jannick\PycharmProjects\NewRemake\Entity\Player.py", line 47, in move
      self.game.map_handler.load(self.game.map_handler.new_map_name(dest_x, dest_y))
    File "C:\Users\Jannick\PycharmProjects\NewRemake\World\MapBuilder.py", line 26, in load
      self.get_map_configuration(map_config)
    File "C:\Users\Jannick\PycharmProjects\NewRemake\World\MapBuilder.py", line 46, in get_map_configuration
      "entitys": self.all_map_entitys[map_config]
  KeyError: 'callaes_forest'
  {'calleas': {'player': {'x': 5, 'y': 5, 'id': 'npc_1'}, '1': {'x': 6, 'y': 8, 'id': 'npc_2'}, '2': {'x': 5, 'y': 8, 'id': 'npc_3'}}, 'calleas_forest': {'player': {'x': 55, 'y': 5, 'id': 'npc_1'}}}
  </code></pre>