Remove default tagline admin notice, hide from feed

Rather than showing an admin notice if the tagline
is the default, let's just not return that default
tagline in the RSS feed.

inc/cleanup.php

@@ -576,6 +576,16 @@ if ((get_option('blogdescription') === 'Just another WordPress site') && isset($
   add_action('admin_notices', 'roots_notice_tagline');
 }
 
+// Don't return the default description in the RSS feed if it hasn't been changed
+function roots_remove_default_description($val) {
+  if ($val === 'Just another WordPress site') {
+    return;
+  } else {
+    return $val;
+  }
+}
+add_filter('get_bloginfo_rss', 'roots_remove_default_description');
+
 function roots_notice_tagline_ignore() {
   global $current_user;
   $user_id = $current_user->ID;