Fix peft patch (#1650)

Author: Jintao-Huang

swift/tuners/peft.py

@@ -312,7 +312,8 @@ def hot_patch_peft_module():
 
     # Support type conversion
     def init(self, model: torch.nn.Module, config: Dict[str, LoraConfig], adapter_name):
-        if config.get('default') and isinstance(config['default'].target_modules, str):
+        if isinstance(config, dict) and config.get('default') and isinstance(
+                getattr(config['default'], 'target_modules', None), str):
             # Make sure the regex can find all linear in the module.
             LoraModel._create_and_replace = _create_and_replace_hook2