That doesn't make any sense Adam. You say your field is an integer, so

null='' if field in ('string', 'text', 'password') else None

is the same as

null=None

Which is the default value for null in IS_EMPTY_OR()

So your change shouldn't have many any difference whatsoever, note that by 
changing that you will also make forms put NULL values in string fields 
where you would probably want an empty string.

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