code: def get(key, node=None, default=None):
      
      d = AppData.get_by_key(key)
      if d:
          data = utils.dict_dot(d)
          return data.get(node, default) if node else data
      return {}
docs: Retrieve data
      :param key: 
      :param node: the node_key or the dot notation key to retrieve sub data
              get('myapp', 'this.is.a.nested.dict.data')
              get('my_other_data')
      :param default:
      :return: dict_dot dict object