Can we Avoid Link if value is not in report Cell

Hi,

me giving one URL in report textbox--> action --> go to url (

=IIf(Globals!RenderFormat.Name=

"PDF"OR Globals!RenderFormat.Name="EXCEL"OR Globals!RenderFormat.Name="MHTML" , Nothing,"javascript:void(callPopwindow('"&(Parameters!StoplightUrl.Value)&"?SC="&System.Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(Fields!SupplierCode.Value))&"&ARCID="&(Fields!ArchivalID.Value)&"'))") )

 but IF value is not there no need to come jump to this URL

How can we disable this option.

Regards,

Akhil