skip empty template values

Author: mythz

AiServer.ServiceInterface/Comfy/ComfyClient.cs

@@ -191,6 +191,7 @@ public async Task<ComfyWorkflowResponse> PromptGenerationAsync(ComfyWorkflowRequ
         var requestArgs = comfyRequest.ToObjectDictionary();
         foreach (var entry in requestArgs)
         {
+            if (entry.Value is null or "") continue;
             workflowArgs[entry.Key.ToCamelCase()] = entry.Value;
         }