update app.py error handling

app.py

@@ -29,7 +29,10 @@ def initialize(api_key, model_name):
         return gr.update(choices=[])
 
     if not service_context_module or current_model != model_name:
-        service_context_module = ServiceContextModule(api_key, model_name)
+        try:
+            service_context_module = ServiceContextModule(api_key, model_name)
+        except Exception as e:
+            print(e)
         current_model = model_name
         gr.Info("App started")
         set_global_service_context(