fix: add exception handling

plugins/linkai/utils.py

@@ -31,6 +31,7 @@ class Util:
 
     @staticmethod
     def fetch_app_plugin(app_code: str, plugin_name: str) -> bool:
+        try:
             headers = {"Authorization": "Bearer " + conf().get("linkai_api_key")}
             # do http request
             base_url = conf().get("linkai_api_base", "https://api.link-ai.tech")
@@ -45,3 +46,5 @@ class Util:
             else:
                 logger.warning(f"[LinkAI] find app info exception, res={res}")
                 return False
+        except Exception as e:
+            return False