complete_cumulative_columns: Completes cumulative columns if rows were added with NAs.
Description
If a dataset had a row of NAs added to it (using fill_empty_dates_with_na) then cumulative data columns will have NAs which can cause
issues later. This function fills these values with the previous non-NA value.
Usage
complete_cumulative_columns(data)
Value
a tibble with NAs filled in for cumulative data columns.