Fix ApplicationsManager

Missing return

Akari.Prototype.Server/Services/ApplicationsManager.cs

@@ -194,6 +194,8 @@ namespace Akari.Prototype.Server.Services
             if (!_authManager.TryGetKey(application.Fingerprints, out var fingerprintName, out var fingerprintKey))
             {
                 _logger.LogDebug($"Can't retrieve '{applicationName}' key, no fingerprint auth found");
+
+                return false;
             }
 
             applicationKey = _keyManager.RetrieveKey(applicationName, fingerprintName, fingerprintKey);