code: function _sanitizeDimensions(dimensions) {
    if (dimensions == undefined) {
      dimensions = {};
    }
    for (let property in Utils.DEFAULT_ROOM_DIMENSIONS) {
      if (!(dimensions.hasOwnProperty(property))) {
        dimensions[property] = Utils.DEFAULT_ROOM_DIMENSIONS[property];
      }
    }
    return dimensions;
  }
docs: Sanitize dimensions.
  @param {Utils~RoomDimensions} dimensions
  @return {Utils~RoomDimensions}