[5.3] Correct author column when user is deleted (joomla#45179)

Author: brianteeman

administrator/components/com_content/tmpl/articles/default.php

@@ -321,7 +321,7 @@
                                     <?php echo $this->escape($item->access_level); ?>
                                 </td>
                                 <td class="small d-none d-md-table-cell">
-                                    <?php if ((int) $item->created_by != 0) : ?>
+                                    <?php if (!empty($item->author_name)) : ?>
                                         <a href="<?php echo Route::_('index.php?option=com_users&task=user.edit&id=' . (int) $item->created_by); ?>">
                                             <?php echo $this->escape($item->author_name); ?>
                                         </a>