Return blank if Cell is blank or contains formula)

Im trying to return a "" if L2 is blank. However L2 contains a formula which returns blank if a test is not met. So my formula bellow does not work because the cell is blank only to the eye, it actually contains a formula.


=IF(L2="","",IF(L2<800,"Y","N"))

I tried

=IF(ISTEXT (L3),"",IF(L3<800,"Y","N"))

but did not work

Any help much appreciated.

Thanks