class_docstr: Common base class for Command Invalid errors.
code: def normalized_messages(self) -> dict[Any, Any]:
      errors: dict[Any, Any] = {}
      for exception in self._exceptions:
          errors.update(exception.normalized_messages())
      return errors
  
imports: from typing import Any, Optional
  from flask_babel import lazy_gettext
  from marshmallow import ValidationError
  from superset.exceptions import SupersetException
label_desc: Use image node_id 5 for calling the CommandInvalidError obj's underlying member method code with example usage: obj.normalized_messages() and returns: errors