Fix php error with arbitrary statement in empty

Author: PatelUtkarsh

admin/class-nginx-helper-admin.php

@@ -602,7 +602,7 @@ public function unset_future_post_option_on_delete( $post_id ) {
 			! $this->options['enable_purge'] ||
 			empty( $this->options['future_posts'] ) ||
 			empty( $this->options['future_posts'][ $blog_id ] ) ||
-			empty( isset( $this->options['future_posts'][ $blog_id ][ $post_id ] ) ) ||
+			isset( $this->options['future_posts'][ $blog_id ][ $post_id ] ) ||
 			wp_is_post_revision( $post_id )
 		) {
 			return;