SpecialNuke: Don't add actor names WHERE if no names supplied

Why:

- If submitting the form with no conditions, the `$actornames` variable
  will be an array with a single empty string, which means the WHERE
  clause won't find any matches

What:

- Only add actor names to the WHERE clause if the array contains names
  to check

Bug: T342785
Change-Id: I7f407695583c1d7ebaf81d116578bd336adc5c7f

includes/SpecialNuke.php

@@ -454,9 +454,11 @@ class SpecialNuke extends SpecialPage {
 		if ( $username === '' ) {
 			$queryBuilder->field( 'actor_name', 'rc_user_text' );
 		} else {
-			$actornames = [ $username, ...$tempnames ];
+			$actornames = array_filter( [ $username, ...$tempnames ] );
+			if ( $actornames ) {
 				$queryBuilder->andWhere( [ 'actor_name' => $actornames ] );
 			}
+		}
 
 		if ( $namespace !== null ) {
 			$queryBuilder->andWhere( [ 'page_namespace' => $namespace ] );