Metasearch , fix for empty queries being converted to a single space, parent categories are now autoexpanded.

src/Jackett/Models/AdminSearch.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Jackett.Models
+{
+    public class AdminSearch
+    {
+        public string Query { get; set; }
+        public string Tracker { get; set; }
+        public int Category { get; set; }
+    }
+}