add not-found exception to handle on endpoint

src/DigitalData.ActiveDirectory/DirectorySearchQuery.cs

@@ -1,4 +1,5 @@
-using MediatR;
+using DigitalData.Core.Exceptions;
+using MediatR;
 using Microsoft.Extensions.Options;
 using System.DirectoryServices;
 
@@ -39,8 +40,9 @@ public class DirectorySearchQueryHandler(IOptions<ActiveDirectoryOptions> option
             if (request.properties.Length > 0)
                 searcher.PropertiesToLoad.Clear();
 
-            searcher.PropertiesToLoad.AddRange([.. request.properties.Where(p => p is not null)]);
+            searcher.PropertiesToLoad.AddRange(request.properties.Where(p => p is not null).ToArray());
-            return searcher.FindAll().Cast<SearchResult>().Select(r => r.Properties);
+            var res = searcher.FindAll().Cast<SearchResult>().Select(r => r.Properties);
+            return res.Any() ? res : throw new NotFoundException();
         });
     }
 }