Fix error on dragging when search in treelist is active

Aleksander Machniak

2015-11-05 7caa9f5f505f97565cdac3f82a0b7d3d6df80a46

Fix error on dragging when search in treelist is active

 program/js/treelist.js

@@ -943,7 +943,7 @@
    for (var id in indexbyid) {
      li = id2dom(id);
      item = li.children().first().get(0);
      if (height = item.offsetHeight) {
      if (item && (height = item.offsetHeight)) {
        pos = $(item).offset();
        pos.top += list_scroll_top;
        item_coords[id] = {