removed prints for strategy could not be loaded

changed back to ast, astor is not really needed.

freqtrade/commands/strategy_utils_commands.py

@@ -26,17 +26,11 @@ def start_strategy_update(args: Dict[str, Any]) -> None:
 
     filtered_strategy_objs = []
     for args_strategy in args['strategy_list']:
-        found = False
         for strategy_obj in strategy_objs:
             if strategy_obj['name'] == args_strategy and strategy_obj not in filtered_strategy_objs:
                 filtered_strategy_objs.append(strategy_obj)
-                found = True
                 break
 
-        if not found:
-            print(f"strategy {strategy_obj['name']} could not be loaded or found and is skipped.")
-
     for filtered_strategy_obj in filtered_strategy_objs:
-        # Initialize backtesting object
         instance_strategy_updater = StrategyUpdater()
-        self.start(config, filtered_strategy_obj)
+        instance_strategy_updater.start(config, filtered_strategy_obj)