fix: home page purging can cause an empty array value

which in turn throws an error, so strip empty array values out

src/Cloudflare.php

@@ -296,7 +296,7 @@ private function getLinksToPurgeByPage(SiteTree $page)
         if ($this->isHomePage($page)) {
             $files[] = substr($pageLink, 0, (strrpos($pageLink, '/home')));
         }
-        return $files;
+        return array_filter($files);
     }
 
     /**