fix: empty string should mean except only baseURL

The URI path '' means the baseURL. So ['except' => ''] should
mean that except for the baseURL only.

Author: kenjis

system/Filters/Filters.php

@@ -553,8 +553,8 @@ private function pathApplies(string $uri, $paths)
      */
     private function checkExcept(string $uri, $paths): bool
     {
-        // empty path does not match anything
-        if (empty($paths)) {
+        // empty array does not match anything
+        if ($paths === []) {
             return false;
         }