want to treat space/blank/null value as "status selction value i.e. met"

Hi,

I want to create one object named as "MET" like  or qualification will be = Count(Incident ID]) ForEach([status]) Where( [status] = "Met" ) and in this "Met" I also want to count those Incidents which have status= "NULL/blank"

I have used iIsNull() function but it doesnt work.

please suggest

Thanks in advance