Resolved an issue where the author filter could have a missing label.

If no screen name was set, you'd end up with author filters on edit entries and files where nothing showed in cases where screen name was missing.

You could also throw a php error in php 8.1+

```htmlentities(): Passing null to parameter #1 ($string) of type string is deprecated
ee/ExpressionEngine/Service/Filter/Filter.php, line 227```

system/ee/ExpressionEngine/Service/EntryListing/EntryListing.php

@@ -385,7 +385,7 @@ private function createAuthorFilter($channel_id = null)
 
         $author_filter_options = [];
         foreach ($authors_query->result() as $row) {
-            $author_filter_options[$row->author_id] = $row->screen_name;
+            $author_filter_options[$row->author_id] = (!empty($row->screen_name)) ? $row->screen_name : $row->username;
         }
 
         // Put the current user at the top of the author list