add the [OPTIONS] string automatically if there are flags defined

Signed-off-by: SvenDowideit <SvenDowideit@home.org.au>

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)

an alternative to #7674 - count the defined flags and use that to add the `[OPTIONS]` string.