Remove an unnecessary initialization of `$description` due to the else condition in `get_the_archive_description()`.

See [40976]. See #38487.


git-svn-id: https://develop.svn.wordpress.org/trunk@40977 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/general-template.php

@@ -1551,8 +1551,6 @@ function the_archive_description( $before = '', $after = '' ) {
  * @return string Archive description.
  */
 function get_the_archive_description() {
-	$description = '';
-
 	if ( is_author() ) {
 		$description = get_the_author_meta( 'description' );
 	} elseif ( is_post_type_archive() ) {