Update llm_providers.py

llm_providers.py

@@ -20,9 +20,10 @@ load_dotenv()
 
 
 class LLMProvider:
-    api_keys = None
+
     
     def __init__(self, api_keys: Optional[Dict[str, str]] = None):
+        self.api_keys = {}
         if api_keys:
             self.api_keys = api_keys
         self.providers: Dict[str, Any] = {}