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)

freqtrade/strategy/strategyupdater.py

@@ -3,8 +3,6 @@ import os
 import shutil
 from pathlib import Path
 
-import astor
-
 
 class StrategyUpdater:
     name_mapping = {
@@ -59,7 +57,7 @@ class StrategyUpdater:
         # read the file
         with open(source_file, 'r') as f:
             old_code = f.read()
-        if not os.path.exists(strategies_backup_folder):
+        if not strategies_backup_folder.is_dir():
             os.makedirs(strategies_backup_folder)
 
         # backup original
@@ -96,7 +94,7 @@ class StrategyUpdater:
         ast.increment_lineno(tree, n=1)
 
         # generate the new code from the updated AST
-        return astor.to_source(tree)
+        return ast.dump(tree)
 
 
 # Here we go through each respective node, slice, elt, key ... to replace outdated entries.