Attachment deletion broken after jQuery update

The request is sent successfully and the file is removed, but the row in the uploader remains in place. This occurs due to a change in the behavior
of parseJSON. The response below is already parsed and when running it through parseJSON returned null prior to 1.9; now there's an actual error thrown so the function is returning leaving the attachment row intact.

 	var done = function(response) {

		var json = {};

		try {

			json = $.parseJSON(response);

		} catch (e) {

 			return;

 		}