asp.net mvc - How to check fluentvalidation isnull or isempty rule for a property in MVC 5? -

i made htmlhelper checking isrequired attribute in modelmetadata. depending on this, changed font of label viewmodel propery bold or add asterisk or whatever. added fluentvalidation package, nice use. downside is, don't know how check if property has validation isnull or isempty (which indicate me same isrequired attribute).

thanks help.