Small fixes

Author: Layoric

BlazorDiffusion.ServiceInterface/CreativeService.cs

@@ -29,7 +29,7 @@ public class CreativeService : Service
     public const int DefaultImages = 4;
     public const int DefaultSteps = 25;
 
-    public const int DefaultModeratorImages = 4;
+    public const int DefaultModeratorImages = 8;
     public const int DefaultModeratorSteps = 25;
 
     public const int DefaultMaxWidth = 1280;

BlazorDiffusion/AiServerClient.cs

@@ -18,11 +18,13 @@ public async Task<ImageGenerationResponse> GenerateImageAsync(ImageGeneration re
     {
         var req = request.ToComfy();
         var res = await Client.PostAsync(req);
+        if (res == null)
+            throw new Exception("Failed to generate image.");
         var now = DateTime.UtcNow;
         var key = $"{now:yyyy/MM/dd}/{(long)now.TimeOfDay.TotalMilliseconds}";
 
         var results = new List<ImageGenerationResult>();
-        var seed = (res.Request.Seed ?? 0).ConvertTo<uint>();
+        var seed = (res?.Request?.Seed ?? 0).ConvertTo<uint>();
         foreach (var item in res.Images)
         {
             var artifactUrl = $"{Client.BaseUri.TrimEnd('/')}/uploads{item.Url}";