run_mlm_no_trainer.py requires --model_name_or_path

[david-waterworth]

The examples/pytorch/language-modeling/run_mlm_no_trainer.py script has

parser.add_argument(
    "--model_name_or_path",
    type=str,
    help="Path to pretrained model or model identifier from huggingface.co/models.",
    default=None,
    required=True,
)

Despite there being several checks in the code implying it may be None ie

if args.model_name_or_path:
    model = AutoModelForMaskedLM.from_pretrained(
        args.model_name_or_path,
        from_tf=bool(".ckpt" in args.model_name_or_path),
        config=config,
    )
else:
    logger.info("Training new model from scratch")
    model = AutoModelForMaskedLM.from_config(config)

As far as I can see it's optional, falling back to training a new model from scratch - just like run_mlm.py (I commented out required=True without any obvious issues).

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