Fixed: Root Folder Downloads check giving errors when RuTorrent is used

src/NzbDrone.Core/Download/DownloadClientInfo.cs

@@ -5,6 +5,11 @@ namespace NzbDrone.Core.Download
 {
     public class DownloadClientInfo
     {
+        public DownloadClientInfo()
+        {
+            OutputRootFolders = new List<OsPath>(); 
+        }
+
         public bool IsLocalhost { get; set; }
         public List<OsPath> OutputRootFolders { get; set; }
     }