Fields validating as optional

What is the preferred way to make e.g. a TextField that will pass validation if it is left empty? I've seen two approaches apparently referenced in the documentation:

    additional_comments = models.TextField(required = False)

    additional_comments = models.TextField(blank = True)

and run into errors with the first. Does this mean that I should go with the second, or is there another way that is preferred?

I'm using 1.2.

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