Modify Code to change cell background color

Hello, I have the code below set to change the background color based on certain conditions. What I need to do is change it so that if none of the conditions are met, it does not change the color at all. As it is written now, if anything is entered in a cell that has a background already set, but does not meet these conditions, the cell turns white.

Private Sub Worksheet_Change(ByVal Target As Range)
Dim icolor As Integer

 On Error GoTo ErrorHandler
 
 
'change the conditions below
  Select Case Target.Value
           Case "OFF"
                icolor = 35
            Case "RTO"
                icolor = 8
            Case "vacation"
                icolor = 8
            Case "10-9 SBP"
                icolor = 38
            Case Else
        End Select

 
  Target.Interior.ColorIndex = icolor
ErrorHandler:
    On Error Resume Next
    
 

End Sub

Thanks!
Clayton Grove