If Not Isempty returns "" value but continues to the next statement

this codes checks column G and if the value of it is "Test" gets the corresponding value at column E and pastes it to the next row.

 Sub FindOpcode_Placepart()

Dim sourceCol As Integer, rowCount As Integer, currentRow As Integer
Dim destCol_part As Integer, destRow As Integer
Dim currentRowValue As String
Dim destRowValue As String

sourceCol_opcde = 7   ' find last row in column E
rowCount = Cells(Rows.Count, sourceCol_opcde).End(xlUp).Row
destCol_part = 5
destRow = Cells(Rows.Count, sourceCol_opcde).End(xlUp).Row


'for every row, find the Opcode
For currentRow = 1 To rowCount
    If Cells(currentRow, sourceCol_opcde).Value = "Test" Then
        destRowValue = Cells(currentRow, destCol_part).Text


            If Not IsEmpty(destRowValue) Then ' this code returns "" value but proceeds with the next statement.

             destRow = currentRow + 1
             While Cells(destRow, sourceCol_opcde).Value = "Use-Limit"
                    Cells(destRow, destCol_part).Value = destRowValue
                    destRow = destRow + 1
            Wend

        End If
    End If
Next

End Sub