Fixed: Handle missing category when getting Qbittorrent download path

Fixes RADARR-7HC
Fixes RADARR-V49

(cherry picked from commit 6f97ca9a55471386454457ca52b93733e18e85e4)
(cherry picked from commit e7a8f6332c43f179d4c95b3a8a0253a235bb6eec)

src/NzbDrone.Core/Download/Clients/QBittorrent/QBittorrent.cs

@@ -367,9 +367,7 @@ namespace NzbDrone.Core.Download.Clients.QBittorrent
 
             if (Settings.TvCategory.IsNotNullOrWhiteSpace() && version >= Version.Parse("2.0"))
             {
-                var label = Proxy.GetLabels(Settings)[Settings.TvCategory];
-
-                if (label.SavePath.IsNotNullOrWhiteSpace())
+                if (Proxy.GetLabels(Settings).TryGetValue(Settings.TvCategory, out var label) && label.SavePath.IsNotNullOrWhiteSpace())
                 {
                     var labelDir = new OsPath(label.SavePath);