Print ef info if available in config

Author: filipecosta90

engine/base_client/client.py

@@ -83,7 +83,9 @@ def run_experiment(
             print("Experiment stage: Search")
             for search_id, searcher in enumerate(self.searchers):
                 search_params = {**searcher.search_params}
-                ef = search_params["search_params"]["ef"]
+                ef = "n/a"
+                if "ef" in search_params["search_params"]:
+                    ef = search_params["search_params"]["ef"]
                 parallel = search_params["parallel"] if "parallel" in search_params else 1
                 print(f"\tef runtime: {ef}; #clients {parallel}")
                 search_stats = searcher.search_all(