error check for select case target.address

I have used the code below to copy a cell value to the linked cell of a combobox (this code is an excerp of about 60 cases)

the problem is that the cell value being copied contains a formula such as
=IF(ISTEXT(Properties!AF8), HYPERLINK("#geninfopage", Properties!AH8), IF(ISTEXT(Properties!AK8), HYPERLINK("#geninfopage", Properties!AL8), ""))
which can result in the blank cell depending upon whether a search gives a result. If a blank cell is copied to the linked cell of the combo box an error results.

what I would like to build in is a error check to identify if a cell is empty before executing the code (or not executing)
eg
if worksheets("frontend").range("C11").value <> ""
then execute
else do nothing

Private Sub Worksheet_SelectionChange(ByVal Target As Range)


    Select Case Target.Address


    Case "$C$11"
      Worksheets("front end").Range("chemlinkcell").Value = Worksheets("front end").Range("C11").Value
    Case "$C$12"
      Worksheets("front end").Range("chemlinkcell").Value = Worksheets("front end").Range("C12").Value


  End Select


     


End Sub

Thankyou for any help
Justin

Re: error check for select case target.address

Thanks Dave, that will look better for the user (not having errors popping up confusing things:)