when calling a function, and passing only one arg, but the
function has defaulted args, we were ignoring this case.
Change-Id: I86517f18e30531127664088ddc09ef96dbd8bdf5
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/115033
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>