enhance: serpapi (PR #3489) (#3558)

Co-authored-by: a7m-1st <[email protected]>
Co-authored-by: JINO ROHIT <[email protected]>

Author: 3 people

camel/toolkits/search_toolkit.py

@@ -1344,6 +1344,7 @@ def search_metaso(
         except Exception as e:
             return {"error": f"Metaso search failed: {e}"}
 
+    @dependencies_required("google-search-results")
     @api_keys_required([(None, 'SERPAPI_KEY')])
     def search_serpapi(
         self,
@@ -1414,7 +1415,7 @@ def search_serpapi(
             "filter": filter,
         }
 
-        if custom_params:
+        if custom_params is not None:
             params.update(custom_params)
         try:
             search = SerpApiClient(params)
@@ -1439,10 +1440,6 @@ def search_serpapi(
 
             return {"results": formatted_results}
 
-        except ImportError:
-            return {
-                "error": "serpapi library not installed. Install with: pip install google-search-results"
-            }
         except Exception as e:
             return {"error": f"SerpApi search failed: {e!s}"}