ValueError when stringifying namedtuple exception that contains invalid format string

[correctmost]

Steps to reproduce

The following code triggers a ValueError in astroid:

namedtuple('a','}').format()

This bug was discovered by OSS-Fuzz:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=67054 (report not public yet)

Current behavior

Exception on node <Module.a l.0 at 0x70283aefedb0> in file 'corpus/a.py'
Traceback (most recent call last):
  File "pylint/pylint/checkers/utils.py", line 1365, in safe_infer
    value = next(infer_gen)
            ^^^^^^^^^^^^^^^
  File "astroid/astroid/nodes/node_ng.py", line 168, in infer
    for i, result in enumerate(self._infer(context=context, **kwargs)):
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "astroid/astroid/decorators.py", line 86, in inner
    yield next(generator)
          ^^^^^^^^^^^^^^^
  File "astroid/astroid/decorators.py", line 49, in wrapped
    for res in _func(node, context, **kwargs):
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "astroid/astroid/nodes/node_classes.py", line 1091, in _infer_attribute
    for owner in node.expr.infer(context):
                 ^^^^^^^^^^^^^^^^^^^^^^^^
  File "astroid/astroid/nodes/node_ng.py", line 147, in infer
    for result in self._explicit_inference(
                  ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "astroid/astroid/inference_tip.py", line 70, in inner
    raise e from None
  File "astroid/astroid/inference_tip.py", line 66, in inner
    func(node, context, **kwargs)
  File "astroid/astroid/brain/brain_namedtuple_enum.py", line 228, in infer_named_tuple
    raise UseInferenceDefault("ValueError: " + str(exc)) from exc
                                               ^^^^^^^^
  File "astroid/astroid/exceptions.py", line 67, in __str__
    return self.message.format(**vars(self))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: Single '}' encountered in format string

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "pylint/pylint/utils/ast_walker.py", line 91, in walk
    callback(astroid)
  File "pylint/pylint/checkers/base/docstring_checker.py", line 108, in visit_module
    self._check_docstring("module", node)
  File "pylint/pylint/checkers/base/docstring_checker.py", line 187, in _check_docstring
    func = utils.safe_infer(node.body[0].value.func)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "pylint/pylint/checkers/utils.py", line 1369, in safe_infer
    raise AstroidError from e
astroid.exceptions.AstroidError

Expected behavior

No crash

Version

d8dbc46