add attribute required="required"

[Lionardo]

if field is required add the html attribute required="required" to the selected input field.

[czpython]

fixed by 6fd151f903062dd7630bc87b96480a2f84786410

[czpython]

weird issue happens on some sites, for some reason this causes problems when used on multiple radio buttons, basically I keep getting popup saying field is required, but radio buttons are only one choice.

[FinalAngel]

Can confirm that this does not work