Set filter_list as optional param in serpstack.py

backend/apps/rag/search/serpstack.py

 import json
 import logging
-from typing import List
+from typing import List, Optional
 import requests
 
-from apps.rag.search.main import SearchResult, filter_by_whitelist
+from apps.rag.search.main import SearchResult, get_filtered_results
 from config import SRC_LOG_LEVELS
 
 log = logging.getLogger(__name__)
@@ -11,7 +11,7 @@ log.setLevel(SRC_LOG_LEVELS["RAG"])
 
 
 def search_serpstack(
-    api_key: str, query: str, count: int, whitelist:List[str], https_enabled: bool = True
+    api_key: str, query: str, count: int, filter_list: Optional[List[str]] = None, https_enabled: bool = True
 ) -> list[SearchResult]:
     """Search using serpstack.com's and return the results as a list of SearchResult objects.
 
@@ -35,10 +35,11 @@ def search_serpstack(
     results = sorted(
         json_response.get("organic_results", []), key=lambda x: x.get("position", 0)
     )
-    filtered_results = filter_by_whitelist(results, whitelist)
+    if filter_list:
+        results = get_filtered_results(results, filter_list)
     return [
         SearchResult(
             link=result["url"], title=result.get("title"), snippet=result.get("snippet")
         )
-        for result in filtered_results[:count]
+        for result in results[:count]
     ]