A couple of minor PHP 8 fixes that can be applied now

admin.php

@@ -239,6 +239,13 @@ if ($nb_photos_in_caddie > 0)
       'U_CADDIE' => $link_start.'batch_manager&filter=prefilter-caddie',
       )
     );
+} else {
+  $template->assign(
+    array(
+      'NB_PHOTOS_IN_CADDIE' => 0,
+      'U_CADDIE' => '',
+      )
+    );
 }
 
 // any photos with no md5sum ?
@@ -263,6 +270,13 @@ if ($nb_orphans > 0)
       'U_ORPHANS' => $link_start.'batch_manager&filter=prefilter-no_album',
       )
     );
+} else {
+  $template->assign(
+    array(
+      'NB_ORPHANS' => 0,
+      'U_ORPHANS' => '',
+      )
+    );
 }
 
 // +-----------------------------------------------------------------------+