Fixed an error during asynchronous model loading

app.py

@@ -165,17 +165,38 @@ def handle_model_selection_change(selected_model_name_ui):
             # 尝试加载模型
             status_msg = _load_model_and_tokenizer_core(actual_path, selected_model_name_ui)
             
-            # 改进的错误检查逻辑
+            # 修复后的错误检查逻辑：只依赖状态消息来判断是否成功
             model_load_failed = False
             
-            # 检查是否是明确的错误消息
-            if "Error loading model" in status_msg:
-                model_load_failed = True
-            # 检查模型是否为None，但排除"已经加载"的情况
-            elif MODEL is None:
-                if "is already loaded" not in status_msg:
+            # 检查状态消息中是否包含明确的错误指示
+            error_indicators = [
+                "Error loading model",
+                "Failed to", 
+                "Cannot load",
+                "not defined",
+                "not yet available"
+            ]
+            
+            # 成功指示（任一存在则认为成功）
+            success_indicators = [
+                "loaded to",        # "Model 'XXX' loaded to cuda"
+                "is already loaded", # "Model 'XXX' is already loaded"
+                "loaded.",          # "Tokenizer loaded."
+            ]
+            
+            # 检查是否有错误指示
+            for error_indicator in error_indicators:
+                if error_indicator in status_msg:
+                    model_load_failed = True
+                    break
+            
+            # 如果没有错误指示，检查是否有成功指示
+            if not model_load_failed:
+                has_success_indicator = any(success_indicator in status_msg for success_indicator in success_indicators)
+                # 如果既没有错误指示也没有成功指示，那就可能有问题
+                if not has_success_indicator:
                     model_load_failed = True
-                    status_msg = f"Failed to properly load model '{selected_model_name_ui}'. {status_msg}"
+                    status_msg = f"Uncertain model loading status for '{selected_model_name_ui}'. {status_msg}"
             
             if model_load_failed:
                 # 如果是 MixCoT 模型但加载失败，则关闭 thinking mode