Fixed: SABnzbd test with fail if the API Key is wrong

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

@@ -127,7 +127,7 @@ namespace NzbDrone.Core.Download.Clients.Sabnzbd
             var settings = new SabnzbdSettings();
             settings.InjectFrom(message);
 
-            _sabnzbdProxy.GetVersion(settings);
+            _sabnzbdProxy.GetCategories(settings);
         }
     }
 }

src/NzbDrone.Core/Download/Clients/Sabnzbd/SabnzbdProxy.cs

@@ -85,12 +85,7 @@ namespace NzbDrone.Core.Download.Clients.Sabnzbd
             var request = new RestRequest();
             var action = "mode=get_cats";
 
-            SabnzbdCategoryResponse response;
-
-            if (!Json.TryDeserialize<SabnzbdCategoryResponse>(ProcessRequest(request, action, settings), out response))
-            {
-                response = new SabnzbdCategoryResponse();
-            }
+            var response = Json.Deserialize<SabnzbdCategoryResponse>(ProcessRequest(request, action, settings));
 
             return response;
         }