[python] handle storage Sync issues properly (#17939)

* [python] handle storage Sync issues properly

The variable "path" doesn't exist when handling this exception. Use
self._file and return after reporting the error to avoid further
exceptions.

* Update src/controller/python/chip/storage/__init__.py

Co-authored-by: Boris Zbarsky <bzbarsky@apple.com>

Co-authored-by: Boris Zbarsky <bzbarsky@apple.com>

src/controller/python/chip/storage/__init__.py

@@ -108,8 +108,9 @@ def Sync(self):
  self._file = open(self._path, 'w')
  except Exception as ex:
  logging.warn(
- f"Could not open {path} for writing configuration. Error:")
+ f"Could not open {self._path} for writing configuration. Error:")
  logging.warn(ex)
+ return
 
  self._file.seek(0)
  json.dump(self.jsonData, self._file, ensure_ascii=True, indent=4)