I'm trying to check for duplicates excluding blank cells across a range A3:I3

I've looked at Chip Pearson's site and tried adapting the formula there

=IF(MAX(COUNTIF(INDIRECT("A2:A"&(MAX((A2:A500<"") *ROW(A2:A500)))),INDIRECT("A2:A"&(MAX((A2:A500<"" )*ROW(A2:A500))))))1,"Duplicates","No Duplicates")

to
=IF(MAX(COUNTIF(INDIRECT("A3:I"&(MAX((A3:I3<"")*C OLUMNS(A3:I3)))),INDIRECT("A3:I"&(MAX((A3:I3<"")* COLUMNS(A3:I3))))))1,"Duplicates","No
Duplicates") as an array

but it gives the answer Duplicates if any cell has a value, if they are all
blank the answer is #Ref!

I'm stuck now I'm afraid

I'd appreciate any help. Thanks.