Fixed: Don't fetch capabilities for disabled Newznab/Torznab indexers on create

Also prevent NullRef in GetProxy since definition is null when using FetchCapabilities on add

src/NzbDrone.Core/Indexers/IndexerFactory.cs

@@ -281,10 +281,10 @@ namespace NzbDrone.Core.Indexers
 
             SetProviderCharacteristics(provider, definition);
 
-            if (definition.Implementation is nameof(Newznab.Newznab) or nameof(Torznab.Torznab))
+            if (definition.Enable && definition.Implementation is nameof(Newznab.Newznab) or nameof(Torznab.Torznab))
             {
                 var settings = (NewznabSettings)definition.Settings;
-                settings.Categories = _newznabCapabilitiesProvider.GetCapabilities(settings, definition)?.Categories.GetTorznabCategoryList() ?? null;
+                settings.Categories = _newznabCapabilitiesProvider.GetCapabilities(settings, definition)?.Categories.GetTorznabCategoryList();
             }
 
             if (definition.Implementation == nameof(Cardigann))
@@ -304,7 +304,7 @@ namespace NzbDrone.Core.Indexers
             if (definition.Enable && definition.Implementation is nameof(Newznab.Newznab) or nameof(Torznab.Torznab))
             {
                 var settings = (NewznabSettings)definition.Settings;
-                settings.Categories = _newznabCapabilitiesProvider.GetCapabilities(settings, definition)?.Categories.GetTorznabCategoryList() ?? null;
+                settings.Categories = _newznabCapabilitiesProvider.GetCapabilities(settings, definition)?.Categories.GetTorznabCategoryList();
             }
 
             if (definition.Implementation == nameof(Cardigann))

src/NzbDrone.Core/Indexers/IndexerHttpClient.cs

@@ -53,7 +53,7 @@ namespace NzbDrone.Core.Indexers
         private IIndexerProxy GetProxy(ProviderDefinition definition)
         {
             // Skip DB call if no tags on the indexers
-            if (definition.Tags.Count == 0 && definition.Id > 0)
+            if (definition is { Id: > 0 } && definition.Tags.Count == 0)
             {
                 return null;
             }
@@ -61,7 +61,7 @@ namespace NzbDrone.Core.Indexers
             var proxies = _indexerProxyFactory.GetAvailableProviders();
             var selectedProxy = proxies.FirstOrDefault(proxy => definition.Tags.Intersect(proxy.Definition.Tags).Any());
 
-            if (selectedProxy == null && definition.Id == 0)
+            if (selectedProxy == null && definition is not { Id: not 0 })
             {
                 selectedProxy = proxies.FirstOrDefault(p => p is FlareSolverr);
             }