code: function _migrateToFunnel(explorer, newModel) {
    var firstStep = _defaultStep();
    firstStep.active = true;
  
    _.each(SHARED_FUNNEL_STEP_PROPERTIES, function (key) {
      if(!_.isUndefined(explorer.query[key]) && !_.isNull(explorer.query[key])) {
        firstStep[key] = explorer.query[key]
      }
  
      newModel.query[key] = (key === 'filters') ? [] : null;
    });
  
    if(!_.isUndefined(explorer.query.target_property) && !_.isNull(explorer.query.target_property)) {
      firstStep.actor_property = explorer.query.target_property;
      explorer.query.target_property = null;
    }
  
    newModel.query.steps = [firstStep];
  
    return newModel;
  }
docs: If the query got changed to a funnel, move the step-specific parameters to a steps object.
  @param {Object} explorer The explorer model that is being updated
  @param {Object} newModel The updated explorer model
  @return {Object}         The new set of updates