fix crash on first post closes #100

lib/persona.js

@@ -121,8 +121,11 @@ $(document).ready(function() {
 
 	function setupPaginator() {
 		function appendPageNumber(ev, data) {
-			var el = data.after ? data.after : data.before,
+			var el = data.after ? data.after : data.before;
-				page = Math.ceil((el.attr('data-index') - 1) / config.postsPerPage),
+			if (!el) {
+				return;
+			}
+			var	page = Math.ceil((el.attr('data-index') - 1) / config.postsPerPage),
 				handle = $('<div class="page-number pointer">' + page + '</div>'),
 				shadow = $('<div class="shadow"></div>');