It removes all the missing links and keeps the frames.

Remove All Missing Links

// Removes all missing images in the active document.
// Keeps the frames.

 if (app.documents.length == 0) alert("No documents are  open. Please open a document and try again.");
 var doc = app.activeDocument;
 var links = doc.links;

 for (var i = 0; i<links.length; i++) {
     if (links[i].status == LinkStatus.LINK_MISSING) {
         links[i].parent.remove();
     }
 }