Templates: Fix the return value of `get_the_author_posts_link()`.

When the `$authordata` global isn't defined, return an empty string, rather than `void`.

Props mukesh27, subrataemfluence.
Fixes #45597.


Built from https://develop.svn.wordpress.org/trunk@44616


git-svn-id: http://core.svn.wordpress.org/trunk@44447 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/author-template.php

@@ -288,12 +288,12 @@ function the_author_posts() {
  *
  * @global object $authordata The current author's DB object.
  *
- * @return string An HTML link to the author page.
+ * @return string An HTML link to the author page, or an empty string if $authordata isn't defined.
  */
 function get_the_author_posts_link() {
 	global $authordata;
 	if ( ! is_object( $authordata ) ) {
-		return;
+		return '';
 	}
 
 	$link = sprintf(

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-beta1-44615';
+$wp_version = '5.1-beta1-44616';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.