NULL values to non-existent list elementsAdd NULL values to non-existent list elements
add_nulls(param_list, desired_params)A list in which the names correspond to parameter names and the values correspond to the values to be passed.
A character vector of desired list elements.
A list with the desired elements as described by the
desired_params argument. Any values that were missing in
param_list will be returned with values of NULL.