I have a form where the starting person picks from 1 to 4 approvers. After approvers have done their part the form goes to finance. 

Let's say approver 1 and approver 2 had names filled in for routing, but approve 3 and 4 are blank. How do i get the variable to recognize there is nothing in approver 3 field so it routes then routes to finance as intended. I'm sure i'm missing something very simple at the gateway, but nothing I've tried works.  Any help is greatly appreciated!