PHP Notice: Undefined variable: classes_array

```
Notice: Undefined variable: classes_array in include() (line 18 of backdrop/themes/radix/templates/view/views-view-list.tpl.php).
```

In Radix:

```
<li class="<?php print $classes_array[$id]; ?>"><?php print $row; ?></li>
```

In Backdrop:

```
<li class="<?php if (!empty($row_classes[$id])) { print implode(' ', $row_classes[$id]); } ?>"><?php print $row; ?></li>
```
