Exam form detail if not appeared in previous attempt

if i was absent for july 21 and now while filling exam form for dec 21 ..in exam form it requires details about last appearance in final exam ..soo do i have to feed anything there or leave it blank ...as my result status shows result not available. it ask detail about month in which appeared , year , roll number and result, but since i was absent my result is not available but there's no such option for selecting it .