Fix admin log crash in the lobby

Add test
Fixes https://github.com/space-wizards/space-station-14/issues/5504

Content.Server/Administration/Logs/AdminLogSystem.Json.cs

@@ -32,7 +32,7 @@ public partial class AdminLogSystem
         }
 
         var converterNames = _jsonOptions.Converters.Select(converter => converter.GetType().Name);
-        _sawmill.Info($"Admin log converters found: {string.Join(" ", converterNames)}");
+        _sawmill.Debug($"Admin log converters found: {string.Join(" ", converterNames)}");
     }
 
     private (JsonDocument json, List<Guid> players, List<(int id, string? name)> entities) ToJson(
@@ -82,5 +82,4 @@ public partial class AdminLogSystem
 
         return (JsonSerializer.SerializeToDocument(parsed, _jsonOptions), players, entities);
     }
-
 }