Sort With Macro But Ignore Cells With ""

In Column V there is the formula =IF(ISBLANK(A3),"",COUNTA(N3:U3)/8). This is formatted to percentage. The column shows various percentages, from 0% to 100%, some cells appear blank from the "" part of the formula.

This column is sorted using a macro via a button.
When the sort is ascending, the 0% are at the top and the cells with "" are at the bottom, but when the sort is descending, the "" are at the top.

Is there a way to always to have the "" cells at the bottom whether the sort is ascending or descending. Is this possible to achieve by the code in the sort macro or should it be done by adjusting the formula. Whatever way it is beyond my capabilities.

The code in the sort macro is...

Private Sub CommandButton11_Click()
'Percent Complete
Static iOrder As Integer
Dim oRange As Range
If iOrder = xlAscending Then
iOrder = xlDescending
Else
iOrder = xlAscending
End If
ActiveSheet.Unprotect Password:="duncan"
Set oRange = Range("A3:AZ2000")
oRange.Sort Key1:=Range("V2"), Order1:=iOrder, Header:=xlGuess, _
OrderCustom:=1, MatchCase:=False, Orientation:=xlTopToBottom
ActiveSheet.Protect DrawingObjects:=True, Contents:=True, Scenarios:=True _
, AllowSorting:=True
ActiveSheet.Protect Password:="duncan"
End Sub