R function for dealing with (ignoring) missing/empty arguments inside ellipsis (...)

listWithoutEmptyArgs.R

listWithoutEmptyArgs <- function(...)
  eval(Filter(\(x) !identical(as.character(x), "") || identical(x,""),
              bquote(.(substitute(list(...))))))

# > list(a=1,,b=2:10)
# Error in list(a = 1, , b = 2:10) : argument 2 is empty

# > listWithoutEmptyArgs(a=1,,b=2:10)
# list(a = 1, b = 2:10)

N.B. list is the most universal/general native structure in R, which you can convert to more specialized data structures with e.g. as.data.frame or as.data.table or use for calling function with do.call.