disabled null values serialization

ParadoxSaveParser.WebAPI/BackgroundTasks/SaveParsingOperation.cs

@@ -1,6 +1,7 @@
 using System.IO.Compression;
 using System.Linq;
 using System.Text.Encodings.Web;
+using System.Text.Json.Serialization;
 
 namespace ParadoxSaveParser.WebAPI.BackgroundTasks;
 
@@ -15,9 +16,10 @@ public class SaveParsingOperation
 
     private static readonly JsonSerializerOptions _saveSerializerOptions = new()
     {
-        WriteIndented = true,
+        WriteIndented = false,
         Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
-        MaxDepth = 1024
+        MaxDepth = 1024,
+        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
     };
 
     public SaveParsingOperation(long operationId, SaveFileMetadata meta, ISearchExpression searchQuery,