How to 'no-fill' empty cell that has been highlighted before?

[jannahbuang]

I have code like below. This code will highlight the cell if meet condition. But it also highlight empty cell too.
My problem is to 'no-fill' the highlighted empty cell.
Below is the code sample

            If processrow > 0 Then
            
                yearidx = Year(.Cells(i, "B").value) - Application.Min(target.Rows(1))
                monthidx = Month(.Cells(i, "B").value)
                If Application.CountA(target.Rows(processrow)) > 1 Then
                
                    processrow = processrow + 1
                    target.Rows(processrow).Insert
                End If
                
                targetcol = yearidx * 12 + monthidx + 1
                target.Cells(processrow, targetcol).value = .Cells(i, "C").value
                target.Cells(processrow, targetcol).Interior.ColorIndex = 3
               
                
                                
            End If