Taxonomy: Make sure `wp_list_categories()` correctly outputs term name of `0`.

Props joyously, SergeyBiryukov.
Merges [43605] to the 5.0 branch.
Fixes #44872.
Built from https://develop.svn.wordpress.org/branches/5.0@43712


git-svn-id: http://core.svn.wordpress.org/branches/5.0@43541 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-walker-category.php

@@ -99,7 +99,7 @@ class Walker_Category extends Walker {
 		);
 
 		// Don't generate an element if the category name is empty.
-		if ( ! $cat_name ) {
+		if ( '' === $cat_name ) {
 			return;
 		}
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-43710';
+$wp_version = '5.0-alpha-43712';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.