formatting, add check for empty downloads

source/NerdPack/usr/local/emhttp/plugins/NerdPack/include/PackageQuery.php

@@ -67,5 +67,10 @@ foreach ($pkgs_github_array as $pkg_github) {
     $pkgs_array[] = $pkg;
 }
 
-echo json_encode($pkgs_array);
+$return = [
+        'packages' => $pkgs_array,
+        'empty' => empty($pkgs_downloaded)
+    ];
+
+echo json_encode($return);
 ?>