refactor(SecurityExtensions): Nullbarkeit des out-Wertes in der TryGet-Methode wurde entfernt.

- Warnung ist deaktiviert.
 - Null-Prüfung in der Verwendung entfernt.

DigitalData.Core.Security/Config/AsymCryptParams.cs

@@ -104,7 +104,7 @@ namespace DigitalData.Core.Security.Config
             {
                 foreach(var tDesc in TokenDescriptions)
                 {
-                    if (!Decryptors.TryGet(issuer: tDesc.Issuer, tDesc.Audience, out var decryptor) || decryptor is null)
+                    if (!Decryptors.TryGet(issuer: tDesc.Issuer, tDesc.Audience, out var decryptor))
                         throw new InvalidOperationException(
                             $"Decryptor for Issuer '{tDesc.Issuer}' and Audience '{tDesc.Audience}' could not be found or is null.");