How to add arguments to a DT:datatable based on some if conditions?

I am trying to format a table in shiny using DT::datatable. All my tables can have the default container but only when I pass the container argument that is when I want it to be designed as passed. I have tried multiple options of using if conditions but to no avail. WHen I looked at the datatable code, it says that if the container function is missing it takes a default type. I tried to coerce the same as well but it is still giving me an error.

Please help on this. Below is the code for the same:

table_opt = function(x, edit_y, container_dat = NULL, form_type = "", col_list = NULL){
    ####### Percentage Format
    if(form_type == "%")
                ,editable = edit_y
                ,if(is.null(container_dat)){container = expr()} else {container = container_dat}
                ,rownames = F
                ,options = list(
                  paging = F
                  ,ordering = F
                  ,searching = F
                  ,deferRender = T
                  ,class = "compact"
                  ,headerCallback = JS(
                    "function(thead) {",
                  ,columnDefs = list(list(className = 'dt-center', targets = '_all'))
                )) %>%
                formatPercentage(col_list,digits = 2)

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